Deacetylase inhibitor therapy

ABSTRACT

The present invention relates to deacetylase inhibitor (e.g., histone deacetylase inhibitor) therapies and demonstrates that individuals with low electrolyte levels may have increased susceptibility to certain unwanted side effects such as cardiac side effects. In some embodiments, the invention provides methods of administering DAC or DAC inhibitor therapy that includes electrolyte supplementation.

RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. §119(e) to U.S.provisional patent applications, U.S. Ser. No. 60/811,961, filed Jun. 8,2006; and U.S. Ser. No. 60/909,780, filed Apr. 3, 2007; each of which isincorporated herein by reference.

BACKGROUND OF THE INVENTION

Inhibitors of histone deacetylase (HDAC) play an important role in themodulation of cellular proliferation. There are a wide variety ofpathological cell proliferative conditions for which HDAC inhibitortherapeutics may be used. For instance, HDAC inhibitors have been foundto be useful in the treatment of cancer, and particularly in thetreatment of hematological and lymphoid malignancies. HDAC inhibitorshave also been found to be useful in the treatment of immune-mediateddisorders, conditions, and diseases (e.g., transplant rejection,graft-versus-host disease, immune reaction to gene therapy, autoimmunediseases, traumatic or pathogen induced immune dysregulation,inflammatory diseases, etc.), as well as in the treatment ofcardiovascular diseases. In addition, HDAC inhibitors have been found tobe useful in the treatment of a variety of neurodegenerative diseases.Furthermore, HDAC inhibitors have been implicated in chromatinremodeling.

Given the great potential of HDAC inhibitors as therapeutic agents inthe treatment of a variety of diseases, there is a need to developimproved systems for the administration of HDAC inhibitors, andparticularly for administrations that minimize potential side effects.

SUMMARY OF THE INVENTION

The present invention encompasses the finding that individuals with lowpotassium and/or magnesium levels are susceptible to development ofunwanted side effects if administered deacetylase (“DAC”; e.g., HDAC,TDAC) inhibitor therapy.

The present invention provides methods of administering DAC inhibitortherapy comprising assessing electrolyte (e.g., potassium and/ormagnesium) levels in an individual to whom therapy is to beadministered, and optionally administering electrolyte (e.g., potassiumand/or magnesium) supplementation prior to administration of DACinhibitor therapy.

The present invention further provides methods of administering DACinhibitor therapy comprising assessing electrolyte (e.g., potassiumand/or magnesium) levels in an individual receiving one or more DACinhibitors (whether alone or in combination with one or more othertherapeutic agents, including other chemotherapeutic agents), andoptionally administering electrolyte (e.g., potassium and/or magnesium)supplementation during DAC inhibitor therapy.

Specifically, the present invention demonstrates that electrolytesupplementation prior to, concurrently, and/or sequentially with DACinhibitor treatment mitigates certain side effects that can beassociated with such treatment. This observation indicates thatelectrolyte supplementation can be used in combination with DACinhibitor treatment. In some embodiments, such treatment is of cellproliferative diseases (e.g., cancer or benign neoplasms).

To give but a few examples, in some embodiments, such treatment is ofleukemias (e.g., chronic lymphocytic leukemia (CLL), chronic myelogenousleukemia (CML), acute lymphocytic leukemia (ALL), acute myelogenousleukemia (AML), adult T cell leukemia/lymphoma, etc.), lymphomas (e.g.,Hodgkin's or non-Hodgkin's [e.g., T-cell lymphomas such as peripheralT-cell lymphomas (PTCL), cutaneous T-cell lymphomas (CTCL), etc.]),multiple myeloma, and/or myelodysplastic syndromes. Alternatively oradditionally, in some embodiments, such treatment is of solid tumorssuch as lung, breast, colon, liver, pancreas, ovarian, prostate, kidney,sarcoma, and/or brain. In some embodiments, such treatment is ofimmune-mediated disorders such as graft vs. host disease, rheumatoidarthritis, systemic lupus erythematosus, psoriasis, atopic dermatitis,Crohn's disease, ulcerative colitis, and/or multiple sclerosis. In someembodiments, such treatment is of neurodegenerative diseases such asAlzheimer's disease, Parkinson's disease, and/or Huntington's disease.In some embodiments, the treatment is to enhance gene therapy.

The invention therefore provides, among other things, methods oftreating DAC-mediated disorders, diseases, and/or conditions, includingHDAC-mediated disorders, diseases, and/or conditions, such as cancers orproliferative diseases, comprising administering an electrolytesupplementation prior to, concurrently, and/or or sequentially withadministration of a therapeutically effective amount of at least onedeacetylase (e.g., HDAC) inhibitor.

The invention also provides methods of using a DAC inhibitor in themanufacture of a medicament to treat DAC-mediated diseases includingHDAC-mediated diseases, such as cancers or other proliferative diseasesin a patient that has received and/or is receiving electrolytesupplementation.

DEFINITIONS

Alicyclic: The term “alicyclic,” as used herein, denotes a monovalentgroup derived from a monocyclic or bicyclic saturated carbocyclic ringcompound by the removal of a single hydrogen atom. Examples include, butnot limited to, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl,bicyclo[2.2.1]heptyl, and bicyclo[2.2.2]octyl. Such alicyclic groups maybe further substituted.

Aliphatic: An “aliphatic group” is non-aromatic moiety that may containany combination of carbon atoms, hydrogen atoms, halogen atoms, oxygen,nitrogen or other atoms, and optionally contain one or more units ofunsaturation, e.g., double and/or triple bonds. An aliphatic group maybe straight chained, branched or cyclic and preferably contains betweenabout 1 and about 24 carbon atoms, more typically between about 1 andabout 12 carbon atoms. In addition to aliphatic hydrocarbon groups,aliphatic groups include, for example, polyalkoxyalkyls, such aspolyalkylene glycols, polyamines, and polyimines, for example. Suchaliphatic groups may be further substituted.

Aryl: The term “aryl,” as used herein, refers to a mono- or polycycliccarbocyclic ring system having one or two aromatic rings including, butnot limited to, phenyl, naphthyl, tetrahydronaphthyl, indanyl, idenyland the like. In accordance with the invention, any of the aryls,substituted aryls, heteroaryls and substituted heteroaryls describedherein, can be any aromatic group. Aromatic groups can be substituted orunsubstituted.

Cell Proliferative Disorder, Disease, or Condition: The term “cellproliferative disease or condition” is meant to refer to any conditioncharacterized by aberrant cell growth, preferably abnormally increasedcellular proliferation.

Electrolyte: In general, the term “electrolyte”, as used herein, refersto physiologically relevant free ions. Representative such free ionsinclude, but are not limited to sodium (Na⁺), potassium (K⁺), calcium(Ca²⁺), magnesium (Mg²⁺), chloride (Cl⁻, phosphate (PO4³⁻), andbicarbonate (HCO₃ ⁻).

DAC Inhibitor: In general, any agent that specifically inhibits adeacetylase is considered to be a DAC inhibitor. Any agent thatspecifically inhibits a histone deacetylase is considered to be an HDACinhibitor. Any agent that specifically inhibits a tubulin deacetylase isconsidered to be a TDAC inhibitor. Those of ordinary skill in the artwill appreciate that, unless otherwise set forth herein or known in theart, DAC inhibitors may be administered in any form such as, forexample, salts, esters, prodrugs, etc. Furthermore, DAC inhibitors thatcontain chiral centers may be administered as single stereoisomers or asmixtures, including racemic mixtures, so long as the single stereoisomeror mixture has DAC inhibitor activity.

DAC Inhibitor Therapy: As used herein, the phrase “DAC inhibitortherapy” refers to the regimen by which a DAC inhibitor is administeredto an individual. A DAC inhibitor may be administered alone or incombination with another pharmaceutical agent. In certain embodiments, asynergistic combination of a DAC inhibitor and another agent areadministered. In certain embodiments, a DAC inhibitor is combined with acytotoxic agent approved for use in treating cancer. For example, acombination of romidepsin and a proteasome inhibitor (e.g., bortezomib(VELCADE™)) may be administered. In but another example, a combinationof romidepsin and gemcitabine is administered. In certain embodiments,romidepsin is combined with a taxane. In certain embodiments, romidepsinis combined with a topoisomerase inhibitor. In certain embodiments,romidepsin is combined with an anti-metabolite (e.g., 5-fluorouracil).In certain embodiments, romidepsin is combined with a tyrosine kinaseinhibitor (e.g., Tarceva). In certain embodiments, romidepsin iscombined with a DNA-crosslinking agent (e.g., cis-platin). In certainembodiments, romidepsin is combined with an anthracycline. Commonly, DACinhibitor therapy will involve administration of multiple individualdoses of a DAC inhibitor, spaced out over time. Such individual dosesmay be of different amounts or of the same amount. Furthermore, those ofordinary skill in the art will readily appreciate that different dosingregimens (e.g., number of doses, amount(s) of doses, spacing of doses)are typically employed with different DAC inhibitors. Those of ordinaryskill in the art will also appreciate that, when a DAC inhibitor isadministered in combination with one or more other agents, individualdoses of the DAC inhibitor and the other agent(s) may be administered atthe same time or at different times. For purposes of the presentinvention, when electrolyte supplementation is administered “prior to,during, or after” DAC inhibitor therapy, it may be administered prior toinitiation of DAC inhibitor therapy (i.e., prior to administration ofany dose) or prior to, concurrently with, or after any particular doseor doses.

Halogen: The term “halogen,” as used herein, refers to an atom selectedfrom fluorine, chlorine, bromine, and iodine.

Heteroaryl: The term “heteroaryl,” as used herein, refers to a mono- orpolycyclic (e.g., bi-, or tri-cyclic or more) aromatic radical or ringhaving from five to ten ring atoms of which one or more ring atom isselected from, for example, S, O, and N; zero, one or two ring atoms areadditional heteroatoms independently selected from, for example, S, Oand N; and the remaining ring atoms are carbon, wherein any N or Scontained within the ring may be optionally oxidized. Heteroarylincludes, but is not limited to, pyridinyl, pyrazinyl, pyrimidinyl,pyrrolyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, isooxazolyl,thiadiazolyl, oxadiazolyl, thiophenyl, furanyl, quinolinyl,isoquinolinyl, benzimidazolyl, benzooxazolyl, quinoxalinyl, and thelike.

Heterocyclic: The term “heterocyclic” as used herein, refers to anon-aromatic 5-, 6- or 7-membered ring or a bi- or tri-cyclic groupfused system, where (i) each ring contains between one and threeheteroatoms independently selected from oxygen, sulfur and nitrogen,(ii) each 5-membered ring has 0 to 1 double bonds and each 6-memberedring has 0 to 2 double bonds, (iii) the nitrogen and sulfur heteroatomsmay optionally be oxidized, (iv) the nitrogen heteroatom may optionallybe quaternized, (iv) any of the above rings may be fused to a benzenering, and (v) the remaining ring atoms are carbon atoms which may beoptionally oxo-substituted. Representative heterocycloalkyl groupsinclude, but are not limited to, [1,3]dioxolane, pyrrolidinyl,pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, piperidinyl,piperazinyl, oxazolidinyl, isoxazolidinyl, morpholinyl, thiazolidinyl,isothiazolidinyl, quinoxalinyl, pyridazinonyl, and tetrahydrofuryl. Suchheterocyclic groups may be further substituted.

Initiation: As used herein, the term “initiation” when applied totherapy can refer to a first administration of a DAC (e.g., HDAC)inhibitor to a patient who has not previously received a DAC inhibitor.Alternatively or additionally, the term “initiation” can refer toadministration of a particular dose of a DAC (e.g., HDAC) inhibitorduring therapy of a patient.

Pharmaceutically acceptable carrier or excipient: As used herein, theterm “pharmaceutically acceptable carrier or excipient” means anon-toxic, inert solid, semi-solid or liquid filler, diluent,encapsulating material or formulation auxiliary of any type.

Pharmaceutically acceptable ester: As used herein, the term“pharmaceutically acceptable ester” refers to esters which hydrolyze invivo and include those that break down readily in the human body toleave the parent compound or a salt thereof. Suitable ester groupsinclude, for example, those derived from pharmaceutically acceptablealiphatic carboxylic acids, particularly alkanoic, alkenoic,cycloalkanoic and alkanedioic acids, in which each alkyl or alkenylmoiety advantageously has not more than 6 carbon atoms. Examples ofparticular esters include, but are not limited to, formates, acetates,propionates, butyrates, acrylates and ethylsuccinates.

Pharmaceutically acceptable prodrug: The term “pharmaceuticallyacceptable prodrugs” as used herein refers to those prodrugs of thecompounds of the present invention which are, within the scope of soundmedical judgment, suitable for use in contact with the tissues of humansand lower animals with undue toxicity, irritation, allergic response,and the like, commensurate with a reasonable benefit/risk ratio, andeffective for their intended use, as well as the zwitterionic forms,where possible, of the compounds of the present invention. “Prodrug”, asused herein means a compound which is convertible in vivo by metabolicmeans (e.g. by hydrolysis) to a compound of the invention. Various formsof prodrugs are known in the art, for example, as discussed inBundgaard, (ed.), Design of Prodrugs, Elsevier (1985); Widder, et al.(ed.), Methods in Enzymology, vol. 4, Academic Press (1985);Krogsgaard-Larsen, et al., (ed). “Design and Application of Prodrugs,Textbook of Drug Design and Development, Chapter 5, 113-191 (1991);Bundgaard, et al., Journal of Drug Deliver Reviews, 8:1-38(1992);Bundgaard, J. of Pharmaceutical Sciences, 77:285 et seq. (1988); Higuchiand Stella (eds.) Prodrugs as Novel Drug Delivery Systems, AmericanChemical Society (1975); and Bernard Testa & Joachim Mayer, “HydrolysisIn Drug And Prodrug Metabolism: Chemistry, Biochemistry And Enzymology,”John Wiley and Sons, Ltd. (2002).

Pharmaceutically acceptable salt: As used herein, the term“pharmaceutically acceptable salt” refers to those salts which are,within the scope of sound medical judgment, suitable for use in contactwith the tissues of humans and lower animals without undue toxicity,irritation, allergic response and the like, and are commensurate with areasonable benefit/risk ratio. Pharmaceutically acceptable salts arewell known in the art. For example, S. M. Berge, et al. describespharmaceutically acceptable salts in detail in J. PharmaceuticalSciences, 66: 1-19 (1977). The salts can be prepared in situ during thefinal isolation and purification of the compounds of the invention, orseparately by reacting the free base function with a suitable organicacid. Examples of pharmaceutically acceptable include, but are notlimited to, nontoxic acid addition salts are salts of an amino groupformed with inorganic acids such as hydrochloric acid, hydrobromic acid,phosphoric acid, sulfuric acid and perchloric acid or with organic acidssuch as acetic acid, maleic acid, tartaric acid, citric acid, succinicacid or malonic acid or by using other methods used in the art such asion exchange. Other pharmaceutically acceptable salts include, but arenot limited to, adipate, alginate, ascorbate, aspartate,benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate,camphorsulfonate, citrate, cyclopentanepropionate, digluconate,dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate,glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate,hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate,lauryl sulfate, malate, maleate, malonate, methanesulfonate,2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate,pamoate, pectinate, persulfate, 3-phenylpropionate, phosphate, picrate,pivalate, propionate, stearate, succinate, sulfate, tartrate,thiocyanate, p-toluenesulfonate, undecanoate, valerate salts, and thelike. Representative alkali or alkaline earth metal salts includesodium, lithium, potassium, calcium, magnesium, and the like. Furtherpharmaceutically acceptable salts include, when appropriate, nontoxicammonium, quaternary ammonium, and amine cations formed usingcounterions such as halide, hydroxide, carboxylate, sulfate, phosphate,nitrate, alkyl having from 1 to 6 carbon atoms, sulfonate and arylsulfonate.

Romidepsin: The term “romidepsin” refers to a natural product of thechemical structure:

Romidepsin is a potent HDAC inhibitor and is also known in the art bythe names FK228, FR901228, NSC630176, or depsipeptide. Theidentification and preparation of romidepsin is described in U.S. Pat.No. 4,977,138, which is incorporated herein by reference. The molecularformula is C₂₄H₃₆N₄O₆S₂; and the molecular weight is 540.71. Romidepsinhas the chemical name,(1S,4S,10S,16E,21R)-7-[(2Z)-ethylidene]-4,21-diisopropyl-2-oxa-12,13-dithia-5,8,20,23-tetraazabicyclo[8.7.6]tricos-16-ene-3,6,9,19,22-pentanone.Romidepsin has been assigned the CAS number 128517-07-7. In crystallineform, romidepsin is typically a white to pale yellowish white crystal orcrystalline powder. The term “romidepsin” encompasses this compound andany pharmaceutically acceptable salt forms thereof. In certainembodiments, the term “romidepsin” may also include pro-drugs, esters,protected forms, and derivatives thereof.

Stable: The term “stable”, as used herein, refers to compounds whichpossess stability sufficient to allow manufacture and which maintainsthe integrity of the compound for a sufficient period of time to beuseful for the purposes detailed herein (e.g., therapeutic orprophylactic administration to a subject). In general, combinations ofsubstituents and variables envisioned by this invention are only thosethat result in the formation of stable compounds.

Substituted: The terms “substituted aryl”, “substituted heteroaryl, or“substituted aliphatic,” as used herein, refer to aryl, heteroaryl,aliphatic groups as previously defined, substituted by independentreplacement of one, two, or three or more of the hydrogen atoms thereonwith substituents including, but not limited to, —F, —Cl, —Br, —I, —OH,protected hydroxyl, —NO₂, —CN, —C₁-C₁₂-alkyl optionally substitutedwith, for example, halogen, C₂-C₁₂-alkenyl optionally substituted with,for example, halogen, —C₂-C₁₂-alkynyl optionally substituted with, forexample, halogen, —NH₂, protected amino, —NH—C₁-C₁₂-alkyl,—NH—C₂-C₁₂-alkenyl, —NH—C₂-C₁₂-alkenyl, —NH—C₃-C₁₂-cycloalkyl, —NH-aryl,—NH-heteroaryl, —NH heterocycloalkyl, -dialkylamino, -diarylamino,-diheteroarylamino, —O—C₁-C₁₂-alkyl, —O—C₂-C₁₂-alkenyl,—O—C₂-C₁₂-alkenyl, —O—C₃-C₁₂-cycloalkyl, —O-aryl, —O-heteroaryl,—O-heterocycloalkyl, —C(O)—C₁-C₁₂-alkyl, —C(O)—C₂-C₁₂-alkenyl,—C(O)—C₂-C₁₂-alkenyl, —C(O)—C₃-C₁₂-cycloalkyl, —C(O)-aryl,—C(O)-heteroaryl, —C(O)-heterocycloalkyl, —CONH₂, —CONH—C₁-C₁₂-alkyl,—CONH—C₂-C₁₂-alkenyl, —CONH—C₂-C₁₂-alkenyl, —CONH—C₃-C₁₂-cycloalkyl,—CONH-aryl, —CONH-heteroaryl, —CONH-heterocycloalkyl,—OCO₂—C₁-C₁₂-alkyl, —OCO₂—C₂-C₁₂-alkenyl, —OCO₂—C₂-C₁₂-alkenyl,—OCO₂—C₃-C₁₂-cycloalkyl, —OCO₂-aryl, —OCO₂-heteroaryl,—OCO₂-heterocycloalkyl, —OCONH₂, —OCONH—C₁-C₁₂-alkyl,—OCONH—C₂-C₁₂-alkenyl, —OCONH—C₂-C₁₂-alkenyl, —OCONH—C₃-C₁₂-cycloalkyl,—OCONH-aryl, —OCONH-heteroaryl, —OCONH-heterocycloalkyl,—NHC(O)—C₁-C₁₂-alkyl, —NHC(O)—C₂-C₁₂-alkenyl, —NHC(O)—C₂-C₁₂-alkenyl,—NHC(O)—C₃-C₁₂-cycloalkyl, —NHC(O)-aryl, —NHC(O)-heteroaryl,—NHC(O)-heterocycloalkyl, —NHCO₂—C₁-C₁₂-alkyl, —NHCO₂—C₂-C₁₂-alkenyl,—NHCO₂—C₂-C₁₂-alkenyl, —NHCO₂—C₃-C₁₂-cycloalkyl, —NHCO₂-aryl,—NHCO₂-heteroaryl, —NHCO₂-heterocycloalkyl, —NHC(O)NH₂,—NHC(O)NH—C₁-C₁₂-alkyl, —NHC(O)NH—C₂-C₁₂-alkenyl,—NHC(O)NH—C₂-C₁₂-alkenyl, —NHC(O)NH—C₃-C₁₂-cycloalkyl, —NHC(O)NH-aryl,—NHC(O)NH-heteroaryl, —NHC(O)NH-heterocycloalkyl, NHC(S)NH₂,—NHC(S)NH—C₁-C₁₂-alkyl, —NHC(S)NH—C₂-C₁₂-alkenyl,—NHC(S)NH—C₂-C₁₂-alkenyl, —NHC(S)NH—C₃-C₁₂-cycloalkyl, —NHC(S)NH-aryl,—NHC(S)NH-heteroaryl, —NHC(S)NH-heterocycloalkyl, —NHC(NH)NH₂,—NHC(NH)NH—C₁-C₁₂-alkyl, —NHC(NH)NH—C₂-C₁₂-alkenyl,—NHC(NH)NH—C₂-C₁₂-alkenyl, —NHC(NH)NH—C₃-C₁₂-cycloalkyl,—NHC(NH)NH-aryl, —NHC(NH)NH-heteroaryl, —NHC(NH)NH-heterocycloalkyl,—NHC(NH)—C₁-C₁₂-alkyl, —NHC(NH)—C₂-C₁₂-alkenyl, —NHC(NH)—C₂-C₁₂-alkenyl,—NHC(NH)—C₃-C₁₂-cycloalkyl, —NHC(NH)-aryl, —NHC(NH)-heteroaryl,—NHC(NH)-heterocycloalkyl, —C(NH)NH—C₁-C₁₂-alkyl,—C(NH)NH—C₂-C₁₂-alkenyl, —C(NH)NH—C₂-C₁₂-alkenyl,—C(NH)NH—C₃-C₁₂-cycloalkyl, —C(NH)NH-aryl, —C(NH)NH-heteroaryl,—C(NH)NH-heterocycloalkyl, —S(O)—C₁-C₁₂-alkyl, —S(O)—C₂-C₁₂-alkenyl,—S(O)—C₂-C₁₂-alkenyl, —S(O)—C₃-C₁₂-cycloalkyl, —S(O)-aryl,—S(O)-heteroaryl, —S(O)-heterocycloalkyl, —SO₂NH₂, —SO₂NH—C₁-C₁₂-alkyl,—SO₂NH—C₂-C₁₂-alkenyl, —SO₂NH—C₂-C₁₂-alkenyl, —SO₂NH—C₃-C₁₂-cycloalkyl,—SO₂NH-aryl, —SO₂NH-heteroaryl, —SO₂NH-heterocycloalkyl,—NHSO₂—C₁-C₁₂-alkyl, —NHSO₂—C₂-C₁₂-alkenyl, —NHSO₂—C₂-C₁₂-alkenyl,—NHSO₂—C₃-C₁₂-cycloalkyl, —NHSO₂-aryl, —NHSO₂-heteroaryl,—NHSO₂-heterocycloalkyl, —CH₂NH₂, —CH₂SO₂CH₃, -aryl, -arylalkyl,-heteroaryl, -heteroarylalkyl, -heterocycloalkyl, —C₃-C₁₂-cycloalkyl,polyalkoxyalkyl, polyalkoxy, -methoxymethoxy, -methoxyethoxy, —SH,—S—C₁-C₁₂-alkyl, —S—C₂-C₁₂-alkenyl, —S—C₂-C₁₂-alkenyl,—S—C₃-C₁₂-cycloalkyl, —S-aryl, —S-heteroaryl, —S-heterocycloalkyl, ormethylthiomethyl. It is understood that the aryls, heteroaryls, alkyls,and the like can be further substituted.

Susceptible to: The term “susceptible to”, as used herein refers to anindividual having higher risk (typically based on geneticpredisposition, environmental factors, personal history, or combinationsthereof) of developing a particular disease or disorder, or symptomsthereof, than is observed in the general population.

Therapeutically effective amount: The term “therapeutically effectiveamount” of an active agent or combination of agents is intended to referto an amount of agent(s) which confers a therapeutic effect on thetreated subject, at a reasonable benefit/risk ratio applicable to anymedical treatment. The therapeutic effect may be objective (i.e.,measurable by some test or marker) or subjective (i.e., subject gives anindication of or feels an effect). An effective amount of a particularagent may range from about 0.1 mg/Kg to about 500 mg/Kg, preferably fromabout 1 to about 50 mg/Kg. Effective doses may also vary depending onroute of administration, as well as the possibility of co-usage withother agents. It will be understood, however, that the total daily usageof any particular active agent utilized in accordance with the presentinvention will be decided by the attending physician within the scope ofsound medical judgment. The specific therapeutically effective doselevel for any particular patient will depend upon a variety of factorsincluding the disorder being treated and the severity of the disorder;the activity of the specific compound employed; the specific compositionemployed; the age, body weight, general health, sex and diet of thepatient; the time of administration, route of administration, and rateof excretion of the specific compound employed; the duration of thetreatment; drugs used in combination or contemporaneously with thespecific compound employed; and like factors well known in the medicalarts.

Therapeutic agent: As used herein, the phrase “therapeutic agent” refersto any agent that, when administered to a subject, has a therapeuticeffect and/or elicits a desired biological and/or pharmacologicaleffect.

Treatment: As used herein, the term “treatment” (also “treat” or“treating”) refers to any administration of a biologically active agentthat partially or completely alleviates, ameliorates, relieves,inhibits, delays onset of, reduces severity of and/or reduces incidenceof one or more symptoms or features of a particular disease, disorder,and/or condition. Such treatment may be of a subject who does notexhibit signs of the relevant disease, disorder and/or condition and/orof a subject who exhibits only early signs of the disease, disorder,and/or condition. Alternatively or additionally, such treatment may beof a subject who exhibits one or more established signs of the relevantdisease, disorder and/or condition.

DETAILED DESCRIPTION OF CERTAIN EMBODIMENTS OF THE INVENTION

As indicated, the present invention provides methods and compositionsrelating to treatment of cell proliferation diseases in a patient inneed thereof. The present invention also provides methods andcompositions relating to treatment of individuals with DAC inhibitors,including HDAC inhibitors. In particular, the present invention providesmethods and compositions that involve assessing one or more electrolyte(e.g., potassium and/or magnesium) levels in an individual receiving orscheduled to receive DAC inhibitor therapy, and/or administering to theindividual electrolyte supplementation prior to, concurrently withand/or sequentially with at least one deacetylase inhibitor (e.g., atleast one HDAC inhibitor). The DAC inhibitor may be administered aloneor in combination with one or more other therapeutic agents, includingone or more other chemotherapeutic agents.

Cell Proliferative Disorders, Diseases, or Conditions

In some embodiments, the invention provides methods for treating cellproliferative disorders, diseases or conditions. In general, cellproliferative disorders, diseases or conditions encompass a variety ofconditions characterized by aberrant cell growth, preferably abnormallyincreased cellular proliferation. For example, cell proliferativedisorders, diseases, or conditions include, but are not limited to,cancer, immune-mediated responses and diseases (e.g., transplantrejection, graft vs host disease, immune reaction to gene therapy,autoimmune diseases, pathogen-induced immune dysregulation, etc.),certain circulatory diseases, and certain neurodegenerative diseases.

In certain embodiments, the invention relates to methods of treatingcancer. In general, cancer is a group of diseases which arecharacterized by uncontrolled growth and spread of abnormal cells.Examples of such diseases are carcinomas, sarcomas, leukemias, lymphomasand the like. In certain embodiments, the cancer is a hematologicalmalignancy. In certain embodiments, the cancer is a solid tumor.

For example, cancers include, but are not limited to leukemias andlymphomas such as cutaneous T-cell lymphomas (CTCL), peripheral T-celllymphomas, lymphomas associated with human T-cell lymphotropic virus(HTLV) such as adult T-cell leukemia/lymphoma (ATLL), B-cell lymphoma,acute lymphocytic leukemia, acute nonlymphocytic leukemias, chroniclymphocytic leukemia, chronic myelogenous leukemia, acute myelogenousleukemia, Hodgkin's disease, non-Hodgkin's lymphomas, multiple myeloma,myelodysplastic syndrome, mesothelioma, common solid tumors of adultssuch as head and neck cancers (e.g., oral, laryngeal and esophageal),genitourinary cancers (e.g., prostate, bladder, renal, uterine, ovarian,testicular, rectal and colon), lung cancer, breast cancer, pancreaticcancer, melanoma and other skin cancers, stomach cancer, brain tumors,liver cancer and thyroid cancer, and/or childhood solid tumors such asbrain tumors, neuroblastoma, retinoblastoma, Wilms' tumor, bone tumors,and soft-tissue sarcomas.

In some embodiments, the invention relates to treatment of leukemias.For example, in some embodiments, the invention relates to treatment ofchronic lymphocytic leukemia, chronic myelogenous leukemia, acutelymphocytic leukemia, acute myelogenous leukemia, and/or adult T cellleukemia/lymphoma. In certain embodiments, the invention relates to thetreatment of AML. In certain embodiments, the invention relates to thetreatment of ALL. In certain embodiments, the invention relates to thetreatment of CML. In certain embodiments, the invention relates to thetreatment of CLL.

In some embodiments, the invention relates to treatment of lymphomas.For example, in some embodiments, the invention relates to treatment ofHodgkin's or non-Hodgkin's (e.g., T-cell lymphomas such as peripheralT-cell lymphomas, cutaneous T-cell lymphomas, etc.) lymphoma.

In some embodiments, the invention relates to the treatment of multiplemyeloma and/or myelodysplastic syndromes. In some embodiments, theinvention relates to treatment of solid tumors. In some such embodimentsthe invention relates to treatment of solid tumors such as lung, breast,colon, liver, pancreas, renal, prostate, ovarian, and/or brain. In someembodiments, the invention relates to treatment of pancreatic cancer. Insome embodiments, the invention relates to treatment of renal cancer. Insome embodiments, the invention relates to treatment of prostate cancer.In some embodiments, the invention relates to treatment of sarcomas. Insome embodiments, the invention relates to treatment of soft tissuesarcomas. In some embodiments, the invention relates to methods oftreating one or more immune-mediated responses and diseases.

For example, in some embodiments, the invention relates to treatment ofrejection following transplantation of synthetic or organic graftingmaterials, cells, organs, or tissue to replace all or part of thefunction of tissues, such as heart, kidney, liver, bone marrow, skin,cornea, vessels, lung, pancreas, intestine, limb, muscle, nerve tissue,duodenum, small-bowel, pancreatic-islet-cell, includingxeno-transplants, etc.; treatment of graft-versus-host disease;autoimmune diseases, such as rheumatoid arthritis, systemic lupuserythematosus, thyroiditis, Hashimoto's thyroiditis, multiple sclerosis,myasthenia gravis, type I diabetes, juvenile-onset or recent-onsetdiabetes mellitus, uveitis, Graves' disease, psoriasis, atopicdermatitis, Crohn's disease, ulcerative colitis, vasculitis,auto-antibody mediated diseases, aplastic anemia, Evan's syndrome,autoimmune hemolytic anemia, and the like; and further to treatment ofinfectious diseases causing aberrant immune response and/or activation,such as traumatic or pathogen induced immune dysregulation, includingfor example, that which are caused by hepatitis B and C infections, HIV,Staphylococcus aureus infection, viral encephalitis, sepsis, parasiticdiseases wherein damage is induced by an inflammatory response (e.g.,leprosy). In some embodiments, the invention relates to treatment ofgraft vs host disease, rheumatoid arthritis, systemic lupuserythematosus, psoriasis, atopic dermatitis, Crohn's disease, ulcerativecolitis, and/or multiple sclerosis.

Alternatively or additionally, in some embodiments, the inventionrelates to treatment of an immune response associated with a genetherapy treatment, such as the introduction of foreign genes intoautologous cells and expression of the encoded product. In someembodiments, the invention relates to treatment of circulatory diseases,such as arteriosclerosis, atherosclerosis, vasculitis, polyarteritisnodosa and/or myocarditis.

In some embodiments, the invention relates to treatment of any of avariety of neurodegenerative diseases, a non-exhaustive list of whichincludes:

-   -   I. Disorders characterized by progressive dementia in the        absence of other prominent neurologic signs, such as Alzheimer's        disease; Senile dementia of the Alzheimer type; and Pick's        disease (lobar atrophy);    -   II. Syndromes combining progressive dementia with other        prominent neurologic abnormalities such as A) syndromes        appearing mainly in adults (e.g., Huntington's disease, Multiple        system atrophy combining dementia with ataxia and/or        manifestations of Parkinson's disease, Progressive supranuclear        palsy (Steel-Richardson-Olszewski), diffuse Lewy body disease,        and corticodentatonigral degeneration); and B) syndromes        appearing mainly in children or young adults (e.g.,        Hallervorden-Spatz disease and progressive familial myoclonic        epilepsy);    -   III. Syndromes of gradually developing abnormalities of posture        and movement such as paralysis agitans (Parkinson's disease),        striatonigral degeneration, progressive supranuclear palsy,        torsion dystonia (torsion spasm; dystonia musculorum deformans),        spasmodic torticollis and other dyskinesis, familial tremor, and        Gilles de la Tourette syndrome;    -   IV. Syndromes of progressive ataxia such as cerebellar        degenerations (e.g., cerebellar cortical degeneration and        olivopontocerebellar atrophy (OPCA)); and spinocerebellar        degeneration (Friedreich's ataxia and related disorders);    -   V. Syndromes of central autonomic nervous system failure        (Shy-Drager syndrome);    -   VI. Syndromes of muscular weakness and wasting without sensory        changes (motomeuron disease such as amyotrophic lateral        sclerosis, spinal muscular atrophy (e.g., infantile spinal        muscular atrophy (Werdnig-Hoffman), juvenile spinal muscular        atrophy (Wohlfart-Kugelberg-Welander) and other forms of        familial spinal muscular atrophy), primary lateral sclerosis,        and hereditary spastic paraplegia;    -   VII. Syndromes combining muscular weakness and wasting with        sensory changes (progressive neural muscular atrophy; chronic        familial polyneuropathies) such as peroneal muscular atrophy        (Charcot-Marie-Tooth), hypertrophic interstitial polyneuropathy        (Dejerine-Sottas), and miscellaneous forms of chronic        progressive neuropathy;    -   VIII. Syndromes of progressive visual loss such as pigmentary        degeneration of the retina (retinitis pigmentosa), and        hereditary optic atrophy (Leber's disease).

In some embodiments, the neurodegenerative disease is Alzheimer'sdisease, Parkinson's disease, and/or Huntington's disease.

In some embodiments, the invention relates to treatment of disorders,diseases or conditions associated with chromatin remodeling.

Electrolyte Supplementation

The present invention encompasses the finding that individuals with lowelectrolyte levels (e.g., low potassium and/or magnesium levels) aresusceptible to development of unwanted side effects if administered DACinhibitor therapy (e.g., HDAC inhibitor therapy). Specifically,according to the present invention, such patients may be particularlysusceptible to development of cardiac repolarization effects, includingQTc prolongation (though potentially with no significant cardiacfunction changes), and/or cardiac dysrhythmias. Particular abnormalitiesthat may be observed include an increase in QTc interval and/orabnormalities of the ST segment (e.g., ST segment depression) and/or theT-wave (e.g., T-wave flattening).

According to the present invention, an individual with a potassium serumconcentration below about 3.5 mmol/L (3.5 mEq/L) and/or a serummagnesium concentration below about 0.8 mml/L (1.95 mEq/L) suffers anincreased risk of developing cardiac repolarization effects and/ordysrhythmias.

Serum concentrations of potassium are generally considered to be“normal” when they are within the range of about 3.5-5.5 mEq/L or about3.5-5.0 mEq/L. According to the present invention, it is often desirableto ensure that an individuals' serum potassium concentration is withinthese ranges prior to (and/or during) administration of DAC inhibitortherapy.

Serum concentrations of magnesium are generally considered to be“normal” when they are within the range of about 1.5-2.5 mEq/L or about1.5-2.2 mEq/L or about 1.25-2.5 mEq/L or about 1.25-2.2 mEq/L. Accordingto the present invention, it is often desirable to ensure that anindividual's serum magnesium concentration is within these ranges priorto (and/or during) administration of DAC inhibitor therapy.

In some embodiments of the invention, an individual's serum potassiumand/or magnesium concentration(s) is/are at the high end of the normalrange prior to (and/or during) administration of DAC inhibitor therapy.For example, in some embodiments, an individual's serum potassiumconcentration is at least about 3.8 mEq/L, 3.9 mEq/L, 4.0 mEq/L, or moreprior to and/or during administration of DAC inhibitor therapy. In someembodiments, care is taken not to increase serum potassium concentrationabove about 5.0 mEq/L, 5.2 mEq/L, or 5.5 mEq/L. In some embodiments, anindividual's serum magnesium concentration is at least about 1.9 mEq/Lor more prior to and/or during administration of DAC inhibitor therapy.In some embodiments, care is taken not to increase magnesiumconcentration above about 2.5 mEq/L.

In some embodiments of the present invention, an individual's serumpotassium concentration is at least about 3.5 mEq/L (in some embodimentsat least about 3.8 mEq/L, 3.9 mEq/L, 4.0 mEq/L, or above) and theindividual's serum magnesium concentration is at least about 1.85 mEq/L(in some embodiments at least about 1.25 mEq/L, 1.35 mEq/L, 1.45 mEq/L,1.55 mEq/L, 1.65 mEq/L, 1.75 mEq/L, 1.85 mEq/L, 1.95 mEq/L, or above)prior to and/or during administration of DAC inhibitor therapy.

In some embodiments of the invention, electrolyte levels (e.g.,potassium and/or magnesium levels, optionally calcium levels) areassessed more than once during the course of DAC inhibitor therapy; insome embodiments, different assessments are separated by a regularinterval (e.g., 0.5 days or less, 1 day, 2 days, 3 days, 4 days, 5 days,6 days, 7 days, 8 days, 9 days, 10 days, 11 days, 12 days, 13 days, 14days, 1 month, 2 months, 3 months, 4 months, 5 months, 6 months, etc.).In some embodiments, electrolyte levels are assessed prior to eachadministration of DAC inhibitor.

According to the present invention, an individual's serum potassiumand/or magnesium and/or other electrolyte concentration(s) may beassessed by any available means. For example, samples may be collectedfrom venous or arterial blood and processed for plasma or serumanalysis. In some embodiments, venous sampling is utilized. Anyavailable assay may be utilized for assessment. To give but a fewspecific examples, potassium may be measured by flame photometry, directpotentiometry (see, for example, Koch et al., Clin. Chem. 29:1090,1983), enzymatic methods (e.g., by using tryptophanase, see, forexample, Kimura et al., Clin. Chem. 38:44, 1992), colorimetric methods(e.g., using tetraphenyl borate), etc.; magnesium may be measured bycomplexometric titration, flame emission photometry, atomic absorptionspectophotometry, other spectrophotometric techniques includingenzymatic techniques and dye binding methods (e.g., Magnon dye bindingand bichromatic absorbance, see, for example, Barbour et al., Clin.Chem. 34:2103, 1988; elimination of interference by bilirubin, see, forexample, Rehak et al., Clin. Chem 35:1031, 1989; etc.). In manyembodiments, assays are performed in an automated clinical chemistryanalyzer (e.g., the Abbott ARCHITECT®, etc.)

Where both potassium and magnesium levels are assessed, they may beassessed separately or together. Assessment of potassium and/ormagnesium levels may be performed prior to, at the same time as, and/orafter initiation of DAC inhibitor therapy.

If an individual is determined to have serum potassium and/or magnesiumconcentration(s) that is/are below normal, or below the high end ofnormal as described herein, according to the present invention,potassium and/or magnesium supplementation is administered prior to, atthe same time as, or after initiation of DAC inhibitor therapy. In someembodiments, DAC inhibitor therapy is suspended or delayed until serumpotassium and/or magnesium levels are increased. In some embodiments,DAC inhibitor therapy is suspended or delayed until serum potassiumand/or magnesium levels are increased to within the normal range, or towithin the upper end of the normal range. In some embodiments, DACinhibitor therapy is suspended or delayed until serum potassiumconcentration is above about 3.5 mEq/L; in some embodiments until serumpotassium concentration is above about 3.8 mEq/L. In some embodiments,DAC inhibitor therapy is suspended or delayed until serum magnesiumconcentration is above about 1.25 mEq/L; in some embodiments until serummagnesium concentration is above about 1.8 mEq/L; in some embodimentsuntil serum magnesium concentration is above about 1.9 mEq/L. In someembodiments, DAC inhibitor therapy is suspended or delayed until bothserum potassium and serum magnesium concentrations are increased asdescribed herein.

According to the present invention, electrolyte supplementation, whichmay be administered prior to, concurrently with, and/or subsequent toinitation of DAC inhibitor therapy, may include potassium and/ormagnesium supplementation.

Alternatively or additionally, electrolyte supplementation may includesupplementation of one or more electrolytes selected from the groupconsisting of sodium, potassium, chloride, calcium, magnesium,bicarbonate, phosphate, sulfate, and combinations thereof.

A variety of different potassium supplemental forms are available (see,for example, www.pdrhealth.com). For example, potassium supplements inthe form of potassium chloride, potassium citrate, potassium gluconate,potassium bicarbonate, potassium aspartate and/or potassium orotate canreadily be obtained.

High-potassium (up to 800 milligrams per serving), low-sodium vegetablejuices are available. Some soft drinks are rich in potassium. Some softdrinks contain, potassium gluconate which has a less bitter taste thansome other potassium supplements. Salt substitutes are high inpotassium.

Certain foods high in potassium such as raisins, figs, apricots,sardines, veal, bananas, avocado, and broccoli may be used as potassiumsupplements. Foods high in potassium may provide potassium that iseasily bioavailable and/or may reduce gastrointestinal side effectsassociated with the administration of potassium salts. The potassiumsupplement may also be provided as part of a multivitamin.

Potassium is typically supplemented orally or intravenously, thoughother modes of delivery are within the scope of the present invention.

Certain commercially available forms of potassium supplements include,for example, potassium acetate (e.g., 2 mEq/mL or 4 mEq/mL forinjection); potassium acetate (e.g., 75 mg, 95 mg, 99 mg, and 180 mgtablets and/or 2 mEq/mL, 10 mEq/50 mL, 20 mEq/50 mL, 10 mEq/100 mL, 20mEq/100 mL, 30 mEq/100 mL, 40 mEq/100 mL for injection and/or 20 mEq/15mL, 40 mEq/15 mL liquid and/or 20 mEq or 25 mEq powder forreconstitution, and/or 9 mEq, 10 mEq, or 20 mEq extended releasetablets), and potassium gluconate (e.g., 486 mg, 500 mg, 550 mg, 595 mg,610 mg, and 620 mg tablets).

A variety of different magnesium supplemental forms are also available.For example, supplements in the form of magnesium chloride, magnesiumgluconate, magnesium lactate, magnesium oxide and/or magnesium sulfatecan readily be obtained.

Certain foods high in magnesium such as artichoke, banana, figs,almonds, cashews, pine nuts, brazil nuts, beans, spinach, and tomatoesmay be used as magnesium supplements. The magnesium supplement may alsobe provided as part of a multivitamin.

Certain commercially available forms of magnesium supplements includemagnesium chloride (e.g., 200 mg/ml for injection, 535 mg extendedrelease tablets), magnesium gluconate (3.25 mg/mL, 1000 mg/5 mL liquid;500 mg tablet); magnesium lactate (84 mg extended release tablet);magnesium oxide (e.g., 140 mg, 600 mg capsules, powder, and/or 200 mg,250 mg, 400 mg, 420 mg, and 500 mg tablets), magnesium sulfate (e.g., 40mg/mL, 80 mg/mL, 125 mg/mL, 500 mg/mL for injection).

In some embodiments, electrolyte supplementation administered inaccordance with the present invention treats one or more side effect(s)of DAC (e.g., HDAC) inhibitor therapy. For example, cardiac events havealso been reported in clinical trials with DAC inhibitors. Specifically,ECG abnormalities, tachyarrhythmias, and QTc prolongation have beenreported. ECG effects described as non-specific T-wave or ST segmentabnormalities have been reported with the use of romidepsin (akadepsipeptide), SAHA and LAQ824 (13, 45-47). Supraventriculartachycardia, a dose-limiting event reported from the NCI phase I trialwith romidepsin (aka depsipeptide), was reported as a dose limitingtoxicity in a phase I trial of PXD101, and was reported in patientstreated on a phase I trial of MS-275 when administered daily (13, 48,49). In patients treated with LBH589, a hydroxamic acid, QTcprolongation of greater than 500 ms was noted in 5 of 12 (42%) patientstreated at higher dose levels (50). QTc prolongation associated withLAQ824, another hydroxamic acid, was also reported (47). Of note, astatistically significant increase in QTc interval was reported, with10% of 77 patients treated having QTc prolongation of greater than 60ms. One patient found to have QTc greater than 500 ms experiencedtorsades de pointes when re-treated at a lower dose level (47).

In some embodiments of the present invention, electrolytesupplementation is administered sufficient to reduce or delay onset ofone or more cardiac side effects of DAC (e.g., HDAC) inhibitor therapy.In some embodiments, the electrolyte administration may also reduce oneor more of nausea, vomiting, fatigue (lethargy, malaise, asthenia),increased creatine phospho kinase (CPK), hyperuricemia, hypocalcemia,hyperglycemia, fever, gastritis, diarrhea, abdominal pain, dehydration,weight loss, hypophosphatemia, hyponatremia, hypokalemia,hypomagnesemia, syncope, hypoxia, pleural effusion, hypotension,myocardial ischemia, increased cardiac tropinin I, confusion, and/ormyelosuppression, and combinations thereof.

In some embodiments, cardiac event side effects are selected from thegroup consisting of heart-rate corrected QT (QTc) interval prolongaion,supraventricular arrhythmias (supraventricular tachycardia (SVT)/atrialfibrillation/flutter), and combinations thereof. Specifically, in someembodiments, QTc prolongation and/or other electrophysiological changesare reduced to normal values or ranges

DAC Inhibitors

Deacetylase inhibitors, as that term is used herein are compounds whichare capable of inhibiting the deacetylation of proteins in vivo, invitro or both. In many embodiments, the invention relates to HDACinhibitors, which inhibit the deacetylation of histones. However, thoseof ordinary skill in the art will appreciate that HDAC inhibitors oftenhave a variety of biological activities, at least some of which may wellbe independent of histone deacetylase inhibition.

As indicated, DAC inhibitors inhibit the activity of at least onedeacetylase. Where the DAC inhibitor is an HDAC inhibitor, an increasein acetylated histones occurs and accumulation of acetylated histones isa suitable biological marker for assessing the activity of HDACinhibitors. Therefore, procedures which can assay for the accumulationof acetylated histones can be used to determine the HDAC inhibitoryactivity of agents of interest. Analogous assays can determine DACinhibitory activity

It is understood that agents which can inhibit deacetylase activity(e.g., histone deacetylase activity) typically can also bind to othersubstrates and as often can inhibit or otherwise regulate otherbiologically active molecules such as enzymes.

Suitable DAC or HDAC inhibitors according to the present inventioninclude, for example, 1) hydroxamic acid derivatives; 2) Short-ChainFatty Acids (SCFAs); 3) cyclic tetrapeptides; 4) benzamides; 5)electrophilic ketones; and/or any other class of compounds capable ofinhibiting histone deacetylase. Examples of such DAC inhibitors include,but are not limited to:

-   A) HYDROXAMIC ACID DERIVATIVES such as Suberoylanilide Hydroxamic    Acid (SAHA) (Richon et al., Proc. Natl. Acad. Sci. USA 95, 3003-3007    (1998)); M-Carboxycinnamic Acid Bishydroxamide (CBHA) (Richon et    al., supra); pyroxamide; CBHA; Trichostatin analogues such as    Trichostatin A (TSA) and Trichostatin C (Koghe et al. 1998. Biochem.    Pharmacol. 56: 1359-1364); Salicylihydroxamic Acid (SBHA) (Andrews    et al., International J. Parasitology 30, 761-768 (2000)); Azelaic    Bishydroxamic Acid (ABHA) (Andrews et al., supra);    Azelaic-1-Hydroxamate-9-Anilide (AAHA) (Qiu et al., Mol. Biol. Cell    11, 2069-2083 (2000)); 6-(3-Chlorophenylureido) carpoic Hydroxamic    Acid (3Cl-UCHA), Oxamflatin [(2E)-5-[3-[(phenylsuibnyl-)amino    phenyl]-pent-2-en-4-ynohydroxamic acid (Kim et al. Oncogene, 18:    2461 2470 (1999)); A-161906, Scriptaid (Su et al. 2000 Cancer    Research, 60: 3137-3142); PXD-101 (Prolifix); LAQ-824; CHAP; MW2796    (Andrews et al., supra); and MW2996 (Andrews et al., supra).-   B) CYCLIC TETRAPEPTIDES such as Trapoxin A (TPX)-Cyclic Tetrapeptide    (cyclo-(L-phenylalanyl-L-phenylalanyl-D-pipecolinyl-L-2-amin-o-8-oxo-9,10-epoxy    decanoyl)) (Kijima et al., J Biol. Chem. 268, 22429-22435 (1993));    FR901228 (FK 228, Depsipeptide, Romidepsin) (Nakajima et al., Ex.    Cell Res. 241, 126-133 (1998)); FR225497 Cyclic Tetrapeptide (H.    Mori et al., PCT Application WO 00/08048 (Feb. 17, 2000)); Apicidin    Cyclic Tetrapeptide    [cyclo(NO-methyl-L-tryptophanyl-L-isoleucinyl-D-pipe-colinyl-L-2-amino-8oxodecanoyl)]    (Darkin-Rattray et al., Proc. Natl. Acad. Sci. USA 93, 1314313147    (1996)); Apicidin Ia, Apicidin Ib, Apicidin Ic, Apicidin IIa, and    Apicidin IIb (P. Dulski a al., PCT Application WO 97/11366); CHAP,    HC-Toxin Cyclic Tetrapeptide (Bosch et al., Plant Cell 7, 1941-1950    (1995)); WF27082 Cyclic Tetrapeptide (PCT Application WO 98/48825);    and Chiamydocin (Bosch et al., supra).-   C) SHORT CHAIN FATTY ACID (SCFA) DERIVATIVES such as: Sodium    Butyrate (Cousens et al., J. Biol. Chem. 254, 1716-1723 (1979));    Isovalerate (McBain et al., Biochem. Pharm. 53: 1357-1368 (1997));    Valerate (McBain et al., supra); 4 Phenylbutyrate (4-PBA) (Lea and    Tulsyan, Anticancer Research, 15, 879-873 (1995)); Phenylbutyrate    (PB) (Wang et al., Cancer Research, 59, 2766-2799 (1999));    Propionate (McBain et al., supra); Butyramide (Lea and Tulsyan,    supra); Isobutyramide (Lea and Tulsyan, supra); Phenylacetate (Lea    and Tulsyan, supra); 3-Bromopropionate (Lea and Tulsyan, supra);    Tributyrin (Guan et al., Cancer Research, 60, 749-755 (2000));    Valproic acid and Valproate.-   D) BENZAMIDE DERIVATIVES such as CI-994; MS-275    [N-(2-aminophenyl)-4-[N-(pyridin-3-ylmethoxycarbonyl)aminomethyl]benzamid-e]    (Saito et al., Proc. Natl. Acad. Sci. USA 96, 4592-4597 (1999)); and    3′-amino derivative of MS-27-275 (Saito et al., supra).-   E) ELECTROPHILIC KETONE DERIVATIVES such as trifluoromethyl ketones    (Frey et al, Bioorganic & Med. Chem. Lett. (2002), 12, 3443-3447;    U.S. Pat. No. 6,511,990) and α-keto amides such as    N-methyl-α-ketoamides.-   F) OTHER DAC Inhibitors such as Depudecin (Kwon et al. 1998. PNAS    95: 3356-3361).

In some embodiments, the DAC or HDAC inhibitor used in the method of theinvention is represented by formula (I):

wherein

-   -   m is 1, 2, 3 or 4;    -   n is 0, 1, 2 or 3;    -   p and q are independently 1 or 2;    -   X is O, NH, or NR₈;    -   R₁, R₂, and R₃ are independently hydrogen; unsubstituted or        substituted, branched or unbranched, cyclic or acyclic        aliphatic; unsubstituted or substituted, branched or unbranched,        cyclic or acyclic heteroaliphatic; unsubstituted or substituted        aryl; or unsubstituted or substituted heteroaryl;        -   R₄, R₅, R₆, R₇ and R₈ are independently hydrogen; or            substituted or unsubstituted, branched or unbranched, cyclic            or acyclic aliphatic; and pharmaceutically acceptable forms            thereof. In certain embodiments, m is 1. In certain            embodiments, n is 1. In certain embodiments, p is 1. In            certain embodiments, q is 1. In certain embodiments, X is O.            In certain embodiments, R₁, R₂, and R₃ are unsubstituted, or            substituted, branched or unbranched, acyclic aliphatic. In            certain embodiments, R₄, R₅, R₆, and R₇ are all hydrogen.

In some embodiments, the DAC or HDAC inhibitor used in the method of theinvention is represented by formula (II):

wherein:

m is 1, 2, 3 or 4;

n is 0, 1, 2 or 3;

q is 2 or 3;

X is O, NH, or NR₈;

Y is OR₈, or SR₈;

R₂ and R₃ are independently hydrogen; unsubstituted or substituted,branched or unbranched, cyclic or acyclic aliphatic; unsubstituted orsubstituted, branched or unbranched, cyclic or acylic heteroaliphatic;unsubstituted or substituted aryl; or unsubstituted or substitutedheteroaryl;

R₄, R₅, R₆, R₇ and R₈ are independently selected from hydrogen; orsubstituted or unsubstituted, branched or unbranched, cyclic or acyclicaliphatic; and pharmaceutically acceptable forms thereof. In certainembodiments, m is 1. In certain embodiments, n is 1. In certainembodiments, q is 2. In certain embodiments, X is O. In otherembodiments, X is NH. In certain embodiments, R₂ and R₃ areunsubstituted or substituted, branched or unbranched, acyclic aliphatic.In certain embodiments, R₄, R₅, R₆, and R₇ are all hydrogen.

In some embodiments, the DAC or HDAC inhibitor used in the method of theinvention is represented by formula (III):

wherein

A is a moiety that is cleaved under physiological conditions to yield athiol group and includes, for example, an aliphatic or aromatic acylmoiety (to form a thioester bond); an aliphatic or aromatic thioxy (toform a disulfide bond); or the like; and pharmaceutically acceptableforms thereof. Such aliphatic or aromatic groups can include asubstituted or unsubstituted, branched or unbranched, cyclic or acyclicaliphatic group; a substituted or unsubstituted aromatic group; asubstituted or unsubstituted heteroaromatic group; or a substituted orunsubstituted heterocyclic group. A can be, for example, —COR₁,—SC(═)—O—R₁, or —SR₂. R₁ is independently hydrogen; substituted orunsubstituted amino; substituted or unsubstituted, branched orunbranched, cyclic or acyclic aliphatic; substituted or unsubstitutedaromatic group; substituted or unsubstituted heteroaromatic group; or asubstituted or unsubstituted heterocyclic group. In certain embodiment,R₁ is hydrogen, methyl, ethyl, n-propyl, iso-propyl, n-butyl, isobutyl,benzyl, or bromobenzyl. R₂ is a substituted or unsubstituted, branchedor unbranched, cyclic or acyclic aliphatic group; a substituted orunsubstituted aromatic group; a substituted or unsubstitutedheteroaromatic group; or a substituted or unsubstituted heterocyclicgroup. In certain embodiments, R₂ is methyl, ethyl, 2-hydroxyethyl,isobutyl, fatty acids, a substituted or unsubstituted benzyl, asubstituted or unsubstituted aryl, cysteine, homocysteine, orglutathione.

In some embodiments, the DAC or HDAC inhibitor used in the method of theinvention is represented by formula (IV) or (IV′):

wherein R₁, R₂, R₃, and R₄ are the same or different and represent anamino acid side chain moiety, each R₆ is the same or different andrepresents hydrogen or C₁-C₄ alkyl, and Pr¹ and Pr² are the same ordifferent and represent hydrogen or thiol-protecting group. In certainembodiments, the amino acid side chain moieties are those derived fromnatural amino acids. In other embodiments, the amino acid side chainmoieties are those derived from unnatural amino acids. In certainembodiments, each amino acid side chain is a moiety selected from —H,—C₁-C₆ alkyl, —C₂-C₆ alkenyl, -L-O—C(O)—R′, -L-C(O)—O—R″, -L-A,-L-NR″R″, -L-Het-C(O)-Het-R″, and -L-Het-R″, wherein L is a C₁-C₆alkylene group, A is phenyl or a 5- or 6-membered heteroaryl group, eachR′ is the same or different and represents C₁-C₄ alkyl, each R″ is thesame or different and represent H or C₁-C₆ alkyl, each -Het- is the sameor different and is a heteroatom spacer selected from —O—, —N(R′″)—, and—S—, and each R′″ is the same of different and represents H or C₁-C₄alkyl. In certain embodiments, R₆ is —H. In certain embodiments, Pr¹ andPr² are the same or different and are selected from hydrogen and aprotecting group selected from a benzyl group which is optionallysubstituted by C₁-C₆ alkoxy, C₁-C₆ acyloxy, hydroxy, nitro, picolyl,picolyl-N-oxide, anthrylmethyl, diphenylmethyl, phenyl, t-butyl,adamanthyl, C₁-C₆ acyloxymethyl, C₁-C₆ alkoxymethyl, tetrahydropyranyl,benzylthiomethyl, phenylthiomethyl, thiazolidine, acetamidemethyl,benzamidomethyl, tertiary butoxycarbonyl (BOC), acetyl and itsderivatives, benzoyl and its derivatives, carbamoyl, phenylcarbamoyl,and C₁-C₆ alkylcarbamoyl. In certain embodiments, Pr¹ and Pr² arehydrogen. Various romidepsin derivatives of formula (IV) and (IV′) aredisclosed in published PCT application WO 2006/129105, published Dec. 7,2006; which is incorporated herein by reference.

In some embodiments, the DAC or HDAC inhibitor used in the method of theinvention is represented by formula (V):

wherein

B is a substituted or unsubstituted, saturated or unsaturated aliphaticgroup, a substituted or unsubstituted, saturated or unsaturatedalicyclic group, a substituted or unsubstituted aromatic group, asubstituted or unsubstituted heteroaromatic group, or a substituted orunsubstituted heterocyclic group; R₂₀ is hydroxylamino, hydroxyl, amino,alkylamino, dialkylamino, or alkyloxy group; R₂₁ and R₂₂ areindependently selected from hydrogen, hydroxyl, a substituted orunsubstituted, saturated or unsaturated aliphatic group, a substitutedor unsubstituted, saturated or unsaturated alicyclic group, asubstituted or unsubstituted aromatic group, a substituted orunsubstituted heteroaromatic group, or a substituted or unsubstitutedheterocyclic group. In a particular embodiment of Formula IV, R₂₀ is ahydroxylamino, hydroxyl, amino, methylamino, dimethylamino or methyloxygroup and B is a C₆-alkyl. In yet another embodiment of Formula IV, R₂₁is a hydrogen atom, R₂₂ is a substituted or unsubstituted phenyl and Bis a C₆-alkyl. In further embodiments of Formula IV, R₂₁ is hydrogen andR₂₂ is an α-, β-, or γ-pyridine.

Other examples of DAC or HDAC inhibitors can be found in, for example,U.S. Pat. No. 5,369,108, issued on Nov. 29, 1994, U.S. Pat. No.5,700,811, issued on Dec. 23, 1997, U.S. Pat. No. 5,773,474, issued onJun. 30, 1998, U.S. Pat. No. 5,932,616 issued on Aug. 3, 1999 and U.S.Pat. No. 6,511,990, issued Jan. 28, 2003 all to Breslow et al.; U.S.Pat. No. 5,055,608, issued on Oct. 8, 1991, U.S. Pat. No. 5,175,191,issued on Dec. 29, 1992 and U.S. Pat. No. 5,608,108, issued on Mar. 4,1997 all to Marks et al.; U.S. Provisional Application No. 60/459,826,filed Apr. 1, 2003 in the name of Breslow et al.; as well as, Yoshida,M., et al., Bioassays 17, 423-430 (1995); Saito, A., et al., PNAS USA96, 4592-4597, (1999); Furamai R. et al., PNAS USA 98 (1), 87-92 (2001);Komatsu, Y., et al., Cancer Res. 61(11), 4459-4466 (2001); Su, G. H., etal., Cancer Res. 60, 3137-3142 (2000); Lee, B. I. et al., Cancer Res.61(3), 931-934; Suzuki, T., et al., J. Med. Chem. 42(15), 3001-3003(1999); published PCT Application WO 01/18171 published on Mar. 15, 2001Sloan-Kettering Institute for Cancer Research and The Trustees ofColumbia University; published PCT Application WO02/246144 toHoffmann-La Roche; published PCT Application WO02/22577 to Novartis;published PCT Application WO02/30879 to Prolifix; published PCTApplications WO 01/38322 (published May 31, 2001), WO 01/70675(published on Sep. 27, 2001) and WO 00/71703 (published on Nov. 30,2000) all to Methylgene, Inc.; published PCT Application WO 00/21979published on Oct. 8, 1999 to Fujisawa Pharmaceutical Co., Ltd.;published PCT Application WO 98/40080 published on Mar. 11, 1998 toBeacon Laboratories, L.L.C.; and Curtin M. (Current patent status ofhistone deacetylase inhibitors Expert Opin. Ther. Patents (2002) 12(9):1375-1384 and references cited therein).

Specific non-limiting examples of DAC or HDAC inhibitors are provided inthe Table below. It should be noted that the present inventionencompasses any compounds which both are structurally similar to thecompounds represented below and are capable of inhibiting histonedeacetylases.

Title MS-275

DEPSIPEPTIDE

CI-994

Apicidin

A-161906

Scriptaid

PXD-101

CHAP

LAQ-824

Butyric Acid

Depudecin

Oxamflatin

Trichostatin C

DAC or HDAC inhibitors for use in accordance with the present inventionmay be prepared by any available means including, for example,synthesis, semi-synthesis, or isolation from a natural source.

DAC or HDAC inhibitors for use in accordance with the present inventionmay be isolated or purified. For example, synthesized compounds can beseparated from a reaction mixture, and natural products can be separatedfrom their natural source, by methods such as column chromatography,high pressure liquid chromatography, and/or recrystallization.

A variety of synthetic methodologies for preparing DAC or HDACinhibitors are known in the art. As can be appreciated by the skilledartisan, further methods of synthesizing the compounds of the formulaeherein will be evident to those of ordinary skill in the art.Additionally, the various synthetic steps may be performed in analternate sequence or order to give the desired compounds. Syntheticchemistry transformations and protecting group methodologies (protectionand deprotection) useful in synthesizing the compounds described hereinare known in the art and include, for example, those such as describedin R. Larock, Comprehensive Organic Transformations, VCH Publishers(1989); T. W. Greene and P. G. M. Wuts, Protective Groups in OrganicSynthesis, 2d. Ed., John Wiley and Sons (1991); L. Fieser and M. Fieser,Fieser and Fieser's Reagents for Organic Synthesis, John Wiley and Sons(1994); and L. Paquette, ed., Encyclopedia of Reagents for OrganicSynthesis, John Wiley and Sons (1995), and subsequent editions thereof.

DAC or HDAC inhibitors for use in accordance with the present inventionmay be modified as compared with presently known DAC or HDAC inhibitors,for example, by appending appropriate functionalities to enhanceselective biological properties. Such modifications areknown in the artand may include those which increase biological penetration into a givenbiological system (e.g., blood, lymphatic system, central nervoussystem), increase oral availability, increase solubility to allowadministration by injection, alter metabolism and alter rate ofexcretion.

In some embodiments, a DAC (e.g., HDAC) inhibitor for use in accordancewith the present invention may contain one or more asymmetric centersand thus give rise to enantiomers, diastereomers, and otherstereoisomeric forms that may be defined, in terms of absolutestereochemistry, as (R)- or (S)-, or as (D)- or (L)- for amino acids.The present invention encompasses all such possible isomers, as well astheir racemic and optically pure forms to the extent that they have DACinhibitory activity.

In general, optical isomers may be prepared from their respectiveoptically active precursors by the procedures described above, or byresolving the racemic mixtures. The resolution can be carried out in thepresence of a resolving agent, by chromatography or by repeatedcrystallization or by some combination of these techniques which areknown to those skilled in the art. Further details regarding resolutionscan be found in Jacques, et al., Enantiomers, Racemates, and Resolutions(John Wiley & Sons, 1981).

In some embodiments, a DAC (e.g., HDAC) inhibitor for use in accordancewith the present invention may contain olefinic double bonds, otherunsaturation, or other centers of geometric asymmetry. The presentinvention encompasses both E and Z geometric isomers or cis- andtrans-isomers to the extent that they have DAC inhibitory activity. Thepresent invention likewise encompasses all tautomeric forms that haveDAC inhibitory activity. In general, where a chemical structure ispresented, the configuration of any carbon-carbon double bond appearingherein is selected for convenience only and is not intended to designatea particular configuration unless the text so states or it is otherwiseclear from context; thus a carbon-carbon double bond orcarbon-heteroatom double bond depicted arbitrarily herein as trans maybe cis, trans, or a mixture of the two in any proportion.

DAC inhibitors (e.g., HDAC inhibitors) are particularly useful in thetreatment of neoplasms in vivo. However, they may also be used in vitrofor research or clinical purposes (e.g., determining the susceptibilityof a patient's disease to a particular DAC inhibitor). In certainembodiments, the neoplasm is a benign neoplasm. In other embodiments,the neoplasm is a malignant neoplasm. Any cancer may be treated using aDAC inhibitor alone or in combination with another pharmaceutical agent.

In certain, embodiments, the malignancy is a hematological malignancy.Manifestations can include circulating malignant cells as well asmalignant masses. Hematological malignancies are types of cancers thataffect the blood, bone marrow, and/or lymph nodes. Examples ofhematological malignancies that may be treated using romidepsin include,but are not limited to: acute lymphoblastic leukemia (ALL), acutemyelogenous leukemia (AML), chronic myelogenous leukemia (CML), chroniclymphocytic leukemia (CLL), hairy cell leukemia, Hodgkin's lymphoma,non-Hodgkin's lymphoma, cutaneous T-cell lymphoma (CTCL), peripheralT-cell lymphoma (PTCL), multiple myeloma, and myelodysplastic syndromes.In certain embodiments, the inventive combination is used to treatmultiple myeloma. In certain particular embodiments, the cancer isrelapsed and/or refractory multiple myeloma. In other embodiments, theinventive combination is used to treat chromic lymphocytic leukemia(CLL). In certain particular embodiments, the cancer is relapsed and/orrefractory CLL. In other embodiments, the inventive combination is usedto treat chromic myelogenous leukemia (CML). In certain embodiments, theinventive combination is used to treat acute lymphoblastic leukemia(ALL). In certain embodiments, the inventive combination is used totreat acute myelogenous leukemia (AML). In certain embodiments, thecancer is cutaneous T-cell lymphoma (CTCL). In other embodiments, thecancer is peripheral T-cell lymphoma (PTCL). In certain embodiments, thecancer is a myelodysplastic syndrome.

Other cancers besides hematological malignancies may also be treatedusing DAC inhibitors. In certain embodiments, the cancer is a solidtumor.

Exemplary cancers that may be treated using DAC inhibitor therapy,including combination therapy, include colon cancer, lung cancer, bonecancer, pancreatic cancer, stomach cancer, esophageal cancer, skincancer, brain cancer, liver cancer, ovarian cancer, cervical cancer,uterine cancer, testicular cancer, prostate cancer, bladder cancer,kidney cancer, neuroendocrine cancer, etc.

In certain embodiments, a DAC inhibitor is used to treat pancreaticcancer. In certain embodiments, a DAC inhibitor is used to treatprostate cancer. In certain specific embodiments, the prostate cancer ishormone refractory prostate cancer.

In certain embodiments, a DAC inhibitor is administered in combinationwith one or more additional therapeutic agents, e.g., another cytotoxicagent. Exemplary cytotoxic agents that may be administered incombination with a DAC inhibitor include gemcitabine, decitabine, andflavopiridol. In other embodiments, a DAC inhibitor is administered incombination with an anti-inflammatory agent such as aspirin, ibuprofen,acetaminophen, etc., pain reliever, anti-nausea medication, oranti-pyretic. In certain other embodiments, a DAC inhibitor isadministered in combination with a steroidal agent (e.g.,dexamethasone). In certain embodiments, a DAC inhibitor is administeredin combination with an agent to treat gastrointestinal disturbances suchas nausea, vomiting, and diarrhea. These additional agents may includeanti-emetics, anti-diarrheals, fluid replacement, electrolytereplacement, etc. In other embodiments, a DAC inhibitor is administeredin combination with electrolyte replacement or supplementation such aspotassium, magnesium, and calcium, in particular, potassium andmagnesium. In certain embodiments, a DAC inhibitor is administered incombination an antiarrhythmic agent. In certain embodiments, a DACinhibitor is administered in combination with a platelet booster, forexample, an agent that increases the production of platelets. In certainembodiments, a DAC inhibitor is administered in combination with anagent to boost the production of blood cells such as erythropoietin. Incertain embodiments, a DAC inhibitor is administered in combination withan agent to prevent hyperglycemia. In certain embodiments, a DACinhibitor is not administered with another HDAC or DAC inhibitor.

Pharmaceutical Compositions

In some embodiments, the present invention provides pharmaceuticalcompositions of electrolytes for administration with DAC (e.g., HDAC)inhibitors as provided herein. In some embodiments, inventivepharmaceutical compositions include electrolytes and one or more DAC(e.g., HDAC) inhibitors; in some embodiments, the electrolytes areformulated separately. In some embodiments, inventive pharmaceuticalcompositions are prepared in unit dosage forms. In general, apharmaceutical composition of the present invention includes one or moreactive agents (i.e., one or more electrolytes and/or one or more DACinhibitors) formulated with one or more pharmaceutically acceptablecarriers or excipients.

In some embodiments, the pharmaceutically acceptable carrier is selectedfrom the group consisting of sugars such as lactose, glucose andsucrose; starches such as corn starch and potato starch; cellulose andits derivatives such as sodium carboxymethyl cellulose, ethyl celluloseand cellulose acetate; powdered tragacanth; malt; gelatin; talc;excipients such as cocoa butter and suppository waxes; oils such aspeanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, cornoil and soybean oil; glycols such as propylene glycol; esters such asethyl oleate and ethyl laurate; agar; buffering agents such as magnesiumhydroxide and aluminum hydroxide; alginic acid; pyrogen-free water;isotonic saline; Ringer's solution; ethyl alcohol, and phosphate buffersolutions; non-toxic compatible lubricants such as sodium lauryl sulfateand magnesium stearate; coloring agents; releasing agents; coatingagents; sweetening, flavoring and perfuming agents; preservatives andantioxidants; and combinations thereof. In some embodiments, the pH ofthe ultimate pharmaceutical formulation may be adjusted withpharmaceutically acceptable acids, bases or buffers to enhance thestability of the formulated compound or its delivery form.

Pharmaceutical compositions of this invention may be administered can beadministered by any appropriate means including, for example, orally,parenterally, by inhalation spray, topically, rectally, nasally,buccally, vaginally or via an implanted reservoir. The term parenteralas used herein includes subcutaneous, intracutaneous, intravenous,intramuscular, intraarticular, intraarterial, intrasynovial,infrasternal, intrathecal, intralesional and intracranial injection orinfusion techniques. In many embodiments, pharmaceutical compositionsare administered orally or by injection in accordance with the presentinvention.

Liquid dosage forms for oral administration include pharmaceuticallyacceptable emulsions, microemulsions, solutions, suspensions, syrups andelixirs. In addition to the active agent(s), liquid dosage forms ofpharmaceutical compositions may contain inert diluents commonly used inthe art such as, for example, water or other solvents, solubilizingagents and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethylcarbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propyleneglycol, 1,3-butylene glycol, dimethylformamide, oils (in particular,cottonseed, groundnut, corn, germ, olive, castor, and sesame oils),glycerol, tetrahydrofurfuryl alcohol, polyethylene glycols and fattyacid esters of sorbitan, and mixtures thereof. Besides inert diluents,the oral compositions can also include adjuvants such as wetting agents,emulsifying and suspending agents, sweetening, flavoring, and perfumingagents.

Injectable preparations, for example, sterile injectable aqueous oroleaginous suspensions, may be formulated according to the known artusing suitable dispersing or wetting agents and suspending agents. Asterile injectable preparation may also be a sterile injectablesolution, suspension or emulsion in a nontoxic parenterally acceptablediluent or solvent, for example, as a solution in 1,3-butanediol. Amongthe acceptable vehicles and solvents that may be employed are water,Ringer's solution, U.S.P. and isotonic sodium chloride solution. Inaddition, sterile, fixed oils are conventionally employed as a solventor suspending medium. For this purpose any bland fixed oil can beemployed including synthetic mono- or diglycerides. In addition, fattyacids such as oleic acid are used in the preparation of injectables.

Injectable formulations can be sterilized, for example, by filtrationthrough a bacterial-retaining filter, or by incorporating sterilizingagents in the form of sterile solid compositions which can be dissolvedor dispersed in sterile water or other sterile injectable medium priorto use.

In order to prolong the effect of a drug, it is often desirable to slowthe absorption of the drug from a site of subcutaneous or intramuscularinjection. This may be accomplished by the use of a liquid suspension ofcrystalline or amorphous material with poor water solubility. The rateof absorption of the drug then depends upon its rate of dissolution,which, in turn, may depend upon crystal size and crystalline form.

Alternatively, delayed absorption of a parenterally administered drugform can be accomplished by dissolving or suspending the drug in an oilvehicle. Injectable depot forms can be made by forming microencapsulematrices of the drug in biodegradable polymers such aspolylactide-polyglycolide. Depending upon the ratio of drug to polymerand the nature of the particular polymer employed, the rate of drugrelease can be controlled. Examples of other biodegradable polymersinclude poly(orthoesters) and poly(anhydrides). Depot injectableformulations can also be prepared by entrapping the drug in liposomes ormicroemulsions that are compatible with body tissues.

Compositions for rectal or vaginal administration are typicallysuppositories which can be prepared by mixing the active agents withsuitable non-irritating excipients or carriers such as cocoa butter,polyethylene glycol or a suppository wax which are solid at ambienttemperature but liquid at body temperature and therefore melt in therectum or vaginal cavity and release the active compound.

Solid dosage forms for oral administration include, for example,capsules, tablets, pills, powders, and granules. In such solid dosageforms, the active agent(s) is/are typically mixed with at least oneinert, pharmaceutically acceptable excipient or carrier such as sodiumcitrate or dicalcium phosphate and/or: a) fillers or extenders such asstarches, lactose, sucrose, glucose, mannitol, and silicic acid, b)binders such as, for example, carboxymethylcellulose, alginates,gelatin, polyvinylpyrrolidinone, sucrose, and acacia, c) humectants suchas glycerol, d) disintegrating agents such as agar-agar, calciumcarbonate, potato or tapioca starch, alginic acid, certain silicates,and sodium carbonate, e) solution retarding agents such as paraffin, f)absorption accelerators such as quaternary ammonium compounds, g)wetting agents such as, for example, cetyl alcohol and glycerolmonostearate, h) absorbents such as kaolin and bentonite clay, and i)lubricants such as talc, calcium stearate, magnesium stearate, solidpolyethylene glycols, sodium lauryl sulfate, and mixtures thereof. Inthe case of capsules, tablets and pills, the dosage form may alsocomprise buffering agents, permeation enhancers, and/or other agents toenhance absorption of the active agent(s).

Solid compositions of a similar type may also be employed as fillers insoft and hard-filled gelatin capsules using such excipients as lactoseor milk sugar as well as high molecular weight polyethylene glycols andthe like.

Solid dosage forms such as tablets, dragees, capsules, pills, andgranules can be prepared with coatings and shells such as entericcoatings and other coatings well known in the pharmaceutical formulatingart. They may optionally contain opacifying agents and can also be of acomposition that they release the active ingredient(s) only, orpreferentially, in a certain part of the intestinal tract, optionally,in a delayed manner. Examples of embedding compositions that can be usedinclude polymeric substances and waxes.

In certain embodiments, oral dosage forms are prepared with coatings orby other means to control release of active agent (e.g., DAC or HDACinhibitor) over time and/or location within the gastrointestinal tract.A variety of strategies to achieve such controlled (or extended) releaseare well known in the art, and are within the scope of the presentinvention.

Dosage forms for topical or transdermal administration includeointments, pastes, creams, lotions, gels, powders, solutions, sprays,inhalants or patches. In general, such preparations are prepared byadmixing active agent(s) under sterile conditions with apharmaceutically acceptable carrier and any needed preservatives orbuffers as may be required.

Ophthalmic formulation, ear drops, eye ointments, powders and solutionsare also contemplated as being within the scope of this invention.

Ointments, pastes, creams and gels may contain, in addition to activeagent(s), excipients such as animal and vegetable fats, oils, waxes,paraffins, starch, tragacanth, cellulose derivatives, polyethyleneglycols, silicones, bentonites, silicic acid, talc and zinc oxide, ormixtures thereof.

Powders and sprays can contain, in addition to active agent(s),excipients such as lactose, talc, silicic acid, aluminum hydroxide,calcium silicates and polyamide powder, or mixtures of these substances.Sprays can additionally contain customary propellants such aschlorofluorohydrocarbons.

Transdermal patches have often can provide controlled delivery of acompound to the body. Such dosage forms can be made by dissolving ordispensing the compound in the proper medium. Absorption enhancers canalso be used to increase the flux of the compound across the skin. Therate can be controlled by either providing a rate controlling membraneor by dispersing the compound in a polymer matrix or gel.

For pulmonary delivery, active agent(s) is/are formulated andadministered to the patient in solid or liquid particulate form bydirect administration e.g., inhalation into the respiratory system.Solid or liquid particulate forms of the active agent(s) prepared forpracticing the present invention include particles of respirable size:that is, particles of a size sufficiently small to pass through themouth and larynx upon inhalation and into the bronchi and alveoli of thelungs. Delivery of aerosolized therapeutics, particularly aerosolizedantibiotics, is known in the art (see, for example U.S. Pat. No.5,767,068 to VanDevanter et al., U.S. Pat. No. 5,508,269 to Smith etal., and WO 98/43,650 by Montgomery, all of which are incorporatedherein by reference). A discussion of pulmonary delivery of antibioticsis also found in U.S. Pat. No. 6,014,969, incorporated herein byreference.

The total daily dose of any particular active agent administered to ahuman or other animal in single or in divided doses in accordance withthe present invention can be in amounts, for example, from 0.01 to 50mg/kg body weight or more usually from 0.1 to 25 mg/kg body weight.Single dose compositions may contain such amounts or submultiplesthereof to make up the daily dose. In general, treatment regimensaccording to the present invention comprise administration to a patientin need of such treatment from about 10 mg to about 1000 mg of thecompound(s) of this invention per day in single or multiple doses. Incertain embodiments, about 10-100 mg of the compound is administered perday in single or multiple doses. In certain embodiments, about 100-500mg of the compound is administered per day in single or multiple doses.In certain embodiments, about 250-500 mg of the compound is administeredper day in single or multiple doses. In certain embodiments, about500-750 mg of the compound is administered per day in single or multipledoses.

In the treatment of neoplasms such as cancer in a subject, a DACinhibitor is typically dosed at 1-30 mg/m². In certain embodiments, aDAC inhibitor is dosed at 1-15 mg/m². In certain embodiments, a DACinhibitor is dosed at 5-15 mg/m². In certain particular embodiments, aDAC inhibitor is dosed at 4, 6, 8, 10, 12, 14, 16, 18, or 20 mg/m². ADAC inhibitor is typically administered in a 28 day cycle with the agentbeing administered on days 1, 8 and 15. In certain embodiments, the DACis administered on days 1 and 15 with day 8 being skipped. As would beappreciated by one of skill in the art, the dosage and timing ofadministration of the dosage of the DAC inhibitor may vary depending onthe patient and condition being treated. For example, adverse sideeffects may call for lowering the dosage of DAC inhibitor administered.

Pharmaceutical compositions for use in accordance with the presentinvention can, for example, be administered by injection, intravenously,intraarterially, subdermally, intraperitoneally, intramuscularly, orsubcutaneously; or orally, buccally, nasally, transmucosally, topically,in an ophthalmic preparation, or by inhalation, for example with adosage ranging from about 0.1 to about 500 mg/kg of body weight,alternatively dosages between 1 mg and 1000 mg/dose, every 4 to 120hours, or according to the requirements of the particular drug.

The methods herein contemplate administration of an effective amount ofactive agent or pharmaceutical composition sufficient for a desired orstated effect. Typically, the pharmaceutical compositions of thisinvention will be administered from about 1 to about 6 times per day oralternatively, as a continuous infusion. Such administration can be usedas a chronic or acute therapy. The amount of any particular active agentthat may be combined with pharmaceutically acceptable excipients orcarriers to produce a single dosage form will vary depending upon thehost treated and the particular mode of administration. A typicalpreparation will contain from about 5% to about 95% active compound(w/w). Alternatively, such preparations may contain from about 20% toabout 80% active compound. For romidepsin, preparations may containabout 20-50%, 25-45%, 30-40%, or approximately 32%, 33%, 34%, or 35%active compound.

Lower or higher doses than those recited above may be required. Specificdosage and treatment regimens for any particular patient will dependupon a variety of factors, including the activity of the specificcompound employed, the age, body weight, general health status, sex,diet, time of administration, rate of excretion, drug combination, theseverity and course of the disease, condition or symptoms, the patient'sdisposition to the disease, condition or symptoms, and the judgment ofthe treating physician.

Upon improvement of a patient's condition, a maintenance dose of acompound, composition or combination of this invention may beadministered, if necessary. Subsequently, the dosage or frequency ofadministration, or both, may be reduced, as a function of the symptoms,to a level at which the improved condition is retained when the symptomshave been alleviated to the desired level. Patients may, however,require intermittent treatment on a long-term basis upon any recurrenceof disease symptoms.

When pharmaceutical compositions contain two or more active agents, itis generally the case that each agent is present at dosage levels ofbetween about 1 to 100%, for example about 5 to 95%, of the levelnormally administered in a monotherapy regimen.

Particular formulations and dosing regimens have been established for avariety of HDAC inhibitors. For example, SAHA is commonly administeredwithin a range of about 300-400 mg daily orally; PXD101 is commonlyadministered within a range of about up to 2000 mg/m²/day intravenously(e.g., on days 1 to 5 of a 21 day cycle), and may possibly beadministered orally; MGCD0103 is commonly administered at doses up toabout 27 mg/m² given orally (e.g., daily for about 14 days); LBH589 iscommonly administered at doses up to about 14 mg/m² as an intravenousinfusion (e.g., on days 1-7 of a 21 day cycle); MS-275 is commonlyadministered within a dose range of about 2-12 mg/m² intravenously(e.g., every 14 days).

In the treatment of neoplasms such as cancer in a subject, romidepsin istypically dosed at 0.5 mg/m² to 28 mg/m². In certain embodiments, theromidepsin is dosed in the range of 1 mg/m² to 25 mg/m². In certainembodiments, the romidepsin is dosed in the range of 0.5 mg/m² to 15mg/m². In certain embodiments, the romidepsin is dosed in the range of 1mg/m² to 15 mg/m². In certain embodiments, the romidepsin is dosed inthe range of 1 mg/m² to 8 mg/m². In certain embodiments, the romidepsinis dosed in the range of 0.5 mg/m² to 5 mg/m². In certain embodiments,the romidepsin is dosed in the range of 2 mg/m² to 10 mg/m². In otherembodiments, the dosage ranges from 10 mg/m² to 20 mg/m². In certainembodiments, the dosage ranges from 5 mg/m² to 10 mg/m². In otherembodiments, the dosage ranges from 10 mg/m² to 15 mg/m². In still otherembodiments, the dosage is approximately 8 mg/m². In still otherembodiments, the dosage is approximately 9 mg/m². In still otherembodiments, the dosage is approximately 10 mg/m². In still otherembodiments, the dosage is approximately 11 mg/m². In still otherembodiments, the dosage is approximately 12 mg/m². In still otherembodiments, the dosage is approximately 13 mg/m². In still otherembodiments, the dosage is approximately 14 mg/m². In still otherembodiments, the dosage is approximately 15 mg/m². In certainembodiments, increasing doses of romidepsin are administered over thecourse of a cycle. For example, in certain embodiments, a dose ofapproximately 8 mg/m², followed by a dose of approximately 10 mg/m²,followed by a dose of approximately 12 mg/m² may be administered over acycle. As will be appreciated by one of skill in the art, depending onthe form of romidepsin being administered the dosing may vary. Thedosages given herein are dose equivalents with respect to the activeingredient, romidepsin. In certain embodiments, romidepsin isadministered intravenously. In certain embodiments, the romidepsin isadministered intravenously over a 0.5-6 hour time frame. In certainparticular embodiments, the romidepsin is administered intravenouslyover 30 minutes to 2 hours. In certain particular embodiments, theromidepsin is administered intravenously over 30 minutes to 60 minutes.In certain particular embodiments, the romidepsin is administeredintravenously over 60 minutes to 90 minutes. In certain particularembodiments, the romidepsin is administered intravenously over 90minutes to 120 minutes. In certain particular embodiments, theromidepsin is administered intravenously over 2-3 hours. In certainparticular embodiments, the romidepsin is administered intravenouslyover 3-4 hours. In certain particular embodiments, the romidepsin isadministered intravenously over 5-6 hours. In certain embodiments, theromidepsin is administered one day followed by several days in which theromidepsin is not administered. In certain embodiments, romidepsin isadministered twice a week. In certain embodiments, romidepsin isadministered once a week. In other embodiments, romidepsin isadministered every other week. In certain embodiments, romidepsin isadministered on days 1, 8, and 15 of a 28 day cycle. In certainparticular embodiments, an 8 mg/m² dose of romidepsin is administered onday 1, a 10 mg/m² dose of romidepsin is administered on day 8, and a 12mg/m² dose of romidepsin is administered on day 15. In certainembodiments, romidepsin is administered on days 1 and 15 of a 28 daycycle with day 8 being skipped. The 28 day cycle may be repeated. Incertain embodiments, the 28 day cycle is repeated 3-10 times. In certainembodiments, the treatment includes 5 cycles. In certain embodiments,the treatment includes 6 cycles. In certain embodiments, the treatmentincludes 7 cycles. In certain embodiments, the treatment includes 8cycles. In certain embodiments, greater than 10 cycles are administered.As would be appreciated by one of skill in the art, the dosage andtiming of administration of the dosage of romidepsin may vary dependingon the patient and condition being treated. In certain embodiments, thecycles are continued as long as the patient is responding. The therapymay be terminated once there is disease progression, a cure or remissionis achieved, or side effects become intolerable. Adverse side effectsmay also call for lowering the dosage of romidepsin administered.

Alternatively, romidepsin may be administered orally. In certainembodiments, romidepsin is dosed orally in the range of 10 mg/m² to 300mg/m². In certain embodiments, romidepsin is dosed orally in the rangeof 25 mg/m² to 100 mg/m². In certain embodiments, romidepsin is dosedorally in the range of 100 mg/m² to 200 mg/m². In certain embodiments,romidepsin is dosed orally in the range of 200 mg/m² to 300 mg/m². Incertain embodiments, romidepsin is dosed orally at greater than 300mg/m². In certain embodiments, romidepsin is dosed orally in the rangeof 50 mg/m² to 150 mg/m². In other embodiments, the oral dosage rangesfrom 25 mg/m² to 75 mg/m², As will be appreciated by one of skill in theart, depending on the form of romidepsin being administered the dosingmay vary. The dosages given herein are dose equivalents with respect tothe active ingredient, romidepsin. In certain embodiments, romidepsin isadministered orally on a daily basis. In other embodiments, romidepsinis administered orally every other day. In still other embodiments,romidepsin is administered orally every third, fourth, fifth, or sixthday. In certain embodiments, romidepsin is administered orally everyweek. In certain embodiments, romidepsin is administered orally everyother week. The administration of romidepsin may be terminated oncethere is disease progression, a cure or remission is achieved, or sideeffects become intolerable.

Unless otherwise defined, all technical and scientific terms used hereinare accorded the meaning commonly known to one of ordinary skill in theart. All publications, patents, published patent applications, and otherreferences mentioned herein are hereby incorporated by reference intheir entirety. The embodiments of the invention should not be deemed tobe mutually exclusive and can be combined.

EXEMPLIFICATION

The present invention will be better understood in connection with thefollowing Example, which is intended as an illustration only and notlimiting of the scope of the invention. Various changes andmodifications to the disclosed embodiments will be apparent to thoseskilled in the art and such changes and modifications including, withoutlimitation, those relating to the chemical structures, substituents,derivatives, formulations and/or methods of the invention may be madewithout departing from the spirit of the invention and the scope of theappended claims.

Example 1 Cardiac Side Effects Observed Upon Treatment with Romidepsinnot Seen when Patients Receive Electrolyte Supplementation

The present Example demonstrates that cardiac side effects that areobserved with some patients receiving romidepsin therapy are notobserved when patients receive electrolyte supplementation.

Methods Patients: Patients with relapsed or refractory cutaneous orrelapsed peripheral T-cell lymphoma were enrolled in a phase II trialevaluating the safety and efficacy of romidepsin. The protocol (NCI01-C-0049 or 1312) and informed consent were approved by theInstitutional Review Board of the National Cancer Institute. All dataused in this analysis were obtained from patients who signed an informedconsent and were enrolled and treated at the NIH Warren Grant MagnusonClinical Center. Toxicities were reported using the National CancerInstitute Common Toxicity Criteria, CTC version 2.0. The InclusionCriteria required measurable disease, an age of 18 years or older, anECOG performance status of 0, 1 or 2, and a life expectancy of >12 wk.Required laboratory values included AGC≧1000/μL, platelets≧100,000/μL,bilirubin <1.5× the institutional upper limit of normal (ULN), AST<3×ULN, and creatinine <1.5×ULN. Patients with a myocardial infarctionwithin the previous 6 months, a left ventricular ejection fraction(LVEF) below normal (<45% if performed by MUGA, or <50% if performed byechocardiogram or cardiac MRI), a corrected QT interval of >500 ms,unstable angina, or third degree heart block (unless with pacemaker)were not eligible to enroll.

Dosing regimen: The first 5 patients enrolled in the protocol hadtreatment administered on days 1 and 5 of a 21-day cycle with a startingdose of 18 mg/m², using the original schedule piloted at the NCI.Subsequently, the protocol was amended and all patients were treated ondays 1, 8 and 15 of a 28 day cycle, with a starting dose of 14 mg/m².This change was made for improved patient tolerability. In all cases,romidepsin was administered as a 4 hour intravenous (i.v.) infusion.Provisions for dose reduction were made in the case of grade 3 or 4toxicity. Alternatively, a dose increase was allowed for patients whohad no serious toxicities. Because some patients with observed cardiaceffects had low potassium and magnesium levels, the protocol was lateramended to mandate supplementation of electrolytes to achieve serummagnesium and potassium levels over 0.85 mmol/L and 4.0 mmol/L,respectively, prior to administration of romidepsin (aka depsipeptide).

Cardiac monitoring on protocol:

-   -   (1) ECGs: ECGs were obtained prior to starting therapy, prior to        administration of each dose, within one hour after completion of        the infusion and on the day following treatment. An additional        ECG was obtained on day 3 of the first cycle. ECGs were obtained        using an HP Pagewriter XLi or a GE Marquette MAC1200 and        recorded at 25 mm/sec, with an amplitude of 10 mm/mV and with 60        Hz filtering. They were analyzed using Pagewriter A.04.01 ECG        analysis software (Philips Medical Systems). The QT interval        measurement in this program is made by averaging the five        longest QT intervals with a T or T′ wave amplitude greater than        0.15 mV. All ECGs were interpreted by a single cardiologist        (D.R.R.) in a blinded fashion. T-wave and ST segment        abnormalities were assessed by either R.L.P. or S.E.B. and        grades were based on definitions in the National Cancer        Institute Common Toxicity Criteria, version 2. Grade 1 toxicity        was defined as nonspecific T-wave abnormalities, (flattening or        inversion without ST segment abnormalities) and Grade 2 as ST        segment depression of at least 1 mm in at least 2 leads. If both        were observed, then the ECG was assigned a grade 2 toxicity. A        more precise evaluation of the ECGs scored as grade 2 was        carried out by D.R.R.    -   (2) QTc analysis: The heart rate-corrected QT interval (QTc),        indicating repolarization time, was calculated using Bazett's        formula (QT divided by the square root of the preceding R—R        interval) using the ECG machine software. All ECGs with QTc of        480 ms or greater were reviewed by a cardiologist (D.R.R.). The        QTc analysis was performed on ECGs obtained during the first six        cycles from patients treated on the day 1, 8 and 15 schedule (37        patients). ECGs from patients with an intraventricular        conduction delay, defined as QRS duration greater than 100 ms,        were excluded from the QTc analysis since in that setting the        QTc interval includes a variable depolarization interval that        leads to a prolonged QTc value (22). Six patients met this        criterion and were omitted, leaving ECGs from 31 patients        included in the primary QTc analysis.    -   (3) Cardiac troponin I assay: Serum CPK and Troponin I levels        were obtained prior to each dose and on the day after each dose.        Assays were performed in the Warren Grant Magnuson Clinical        Center clinical laboratories using the Abbott Laboratories MEIA        assay. Since specimens that have not clotted completely can give        false positive results, and samples were frequently drawn from        lines flushed with heparin, abnormal tests were repeated for        confirmation.

Post treatment evaluation of cardiac function (LVEF): Echocardiograms toevaluate cardiac function were also performed on the day following thelast dose of the cycle; day 6 for patients treated on days 1 and 5, orday 16 for patients treated on days 1, 8 and 15.

Evaluation of left ventricular ejection fraction: LVEF evaluations wereperformed at baseline, after the second cycle and every 3 cyclesthereafter using MUGA, echocardiogram or cardiac MRI (23, 24). Apatient's on-study and last available LVEF are included in thisanalysis. Cardiac measurements were performed according to the AmericanSociety of Echocardiography guidelines (25). LVEFs from echocardiogramswere evaluated by an independent reviewer in a blinded manner and wereassessed using the biplane Simpson's method.

Rhythm: A 24-hour Holter monitor was obtained prior to initiatingtherapy to establish a baseline rhythm. Patients were monitored bytelemetry following administration of the first dose until discharge onday 3.

Statistical methods: A global statistical analysis which comparedbaseline QTc with the QTc from ECGs obtained on the day followingtreatment, within a cycle for each of the cycles, was done usingrepeated measures analysis of variance (ANOVA). Individual differencesbetween paired values were evaluated for the statistical significance ofthe change using a Wilcoxon signed rank test. The overall statisticalsignificance for the comparison of changes in worst ECG grade betweentwo time points was determined using an exact marginal homogeneity test(26). All p-values are two-tailed.

Results:

Patient characteristics: Data from 42 of the first 43 patients whoenrolled on this protocol and received at least one cycle of therapy atthe Clinical Center of the NIH are included in these analyses; onepatient found to have an intracardiac tumor after enrollment wasexcluded. Among 42 patients, 25 men and 17 women, the median age was 56(range 27-79). A summary of patient characteristics is presented inTable 1. These patients received a total of 282 cycles and a total of736 doses. Sixteen patients with stable disease or partial or completeresponse received 6 or more cycles, including 8 patients on protocol formore than one year. Eight patients received less than 2 complete cycles.Twenty-two patients had received prior therapy that included doxorubicinat a median dose of 300 mg/m² (40540). All patients had mature T-celllymphomas; 24 patients had cutaneous T-cell lymphoma and 18 patients hadperipheral T-cell lymphomas. Observed toxicities were similar to thoseobserved in the phase I trial and were primarily nausea and fatigue.

TABLE 1 Characteristics of 42 Patients Characteristic Number of patientsGender Male 25 Female 17 Diagnosis CTCL 24 PTCL 18 No Prior doxorubicin20 Prior doxorubicin 22 ECOG 0 10 1 26 2  6 Characteristic Median(range) Age 56 (27-79) Cycles 4 (1-47) Doses 11 (2-93)  Time on protocol(months) 3.6 (0.5-41)

ECG evaluations, T wave and ST depression: In all, 2051 ECGs from 42patients were reviewed. In relation to 736 doses of romidepsin (akadepsipeptide) administered, 1877 ECGs, 83% of the 2250 planned wereobtained pre-treatment, post-treatment, and the day following treatment.ECGs were also obtained on the third day of the first cycle. Amongthese, 649 were obtained prior to drug infusion, 630 ECGs were obtainedwithin one hour following completion of the infusion, and 598 ECGs wereobtained on the day following treatment. An additional 31 ECGs wereobtained on the third day of the first cycle. The remaining 143 ECGswere obtained at unscheduled times.

T-wave (grade 1) or ST segment (grade 2) abnormalities noted on ECGsrelated to all administered doses are summarized in Table 2A and relatedto administration of the first does in Table 2B. Reviewing ECGs from alldoses administered, 22% had grade 1 and 2% had grade 2 abnormalitiesprior to infusion of romidepsin (aka depsipeptide), and 48% had grade 1and 3% had grade 2 abnormalities on ECGs obtained immediately aftercompletion of infusion.

More marked ECG abnormalities were observed on the day followingtreatment, with 69% having grade 1 and 11% having grade 2 abnormalities.With the administration of the first dose, grade 1 ECGs abnormalities,consisting of T-wave flattening, were noted in 5% (2) of patients priorto initiating protocol, in 18% immediately post-infusion, in 44% on theday after treatment and in 45% on day 3 after treatment. Of note, STsegment depression, grade 2, was only detected in a few of the ECGsobtained on day 2 and was not observed on day 3. Similar results wereobserved when only the ECGs from the 37 patients treated on the day 1,8, and 15 schedule were evaluated.

Ascertaining the worst ECG grade observed at any time during treatmentfor each of the 42 patients, 45% had grade 1 and 52% had grade 2abnormalities at some point (Table 2C). Similar results, 43% and 54%,respectively, were obtained when evaluating ECGs obtained from the 37patients treated on the day 1, 8, and 15 schedule.

Thus, the majority of ECGs demonstrated some T-wave or ST segmentabnormality after administration of romidepsin.

TABLE 2A Summary of T-wave and ST segment abnormalities associated withdepsipeptide (n = 42) # of ECGs Grade 0 Grade 1 Grade 2 Pre-treatment649 76% 22%  2% Immediate post 630 49% 48%  3% Day after 598 20% 69% 11%

TABLE 2B ECG abnormalities associated with the first dose of the firstcycle (n = 42) # of ECGs Grade 0 Grade 1 Grade 2 Pre 42 95%  5% Post 3982% 18% Day 2 41 49% 44% 7% Day 3 31 55% 45%

TABLE 2C ECG abnormalities associated with the indicated cycle oftherapy. # of Patients Grade 0 Grade 1 Grade 2 Cycle 1 only 42 19% 57%24% All cycles 42  2% 45% 52%

To determine whether the observed ECG changes had resolved at the timepatients presented for their next dose or new cycle, the ECG grade fromthe 37 patients treated on the day 1, 8, and 15 schedule were evaluated.

Upon presentation for treatment on day 8, the ECGs of nine of 18patients who had grade 1 and two of three patients who had grade 2abnormalities after their first dose had reverted to normal (Table 3A).Among 16 patients who had no abnormalities surrounding the day 1 dose,two returned with grade 1 abnormalities (overall test for changes ingrade: p=0.0248). Similar results were observed when patients returnedfor day 15 treatment (Table 3A; overall test for changes in grade:p=0.0033).

The ECG grade at the time patients returned for the next cycle oftherapy was also evaluated. Twenty-eight of the 34 patients returningfor the second cycle of therapy had no evidence of T-wave or ST-segmentabnormalities; these included 18 of 21 patients who had grade 1, and 4of 7 patients who had grade 2 ECG abnormalities in the first cycle. Sixpatients with persistent abnormalities had the same or improved ECGgrade. One patient with a grade 1 ECG at baseline was scored as grade 2in the first cycle and returned for cycle 2 with a grade 2 ECG. Datafrom later cycles are presented in Table 3B (all p<0.0001 forcomparisons noted for changes in grade for all three cycles compared)and suggest similar trends. ECGs scored as grade 2 were reviewed by acardiologist for changes consistent with evidence of ischemia defined as1 mm of ST segment depression 80 msec after the end of the QRS segment.Thirty-one of 69, 45%, met these criteria.

These observed ECG abnormalities raised the question of whethermyocardial damage or dysfunction would be associated with theadministration of romidepsin.

TABLE 3A Shift tables showing the relationship between the worst ECGabnormalities following a dose of depsipeptide and the ECG gradeobserved at presentation for the next dose. Pre-treatment day 8 (n = 37)Grade 0 1 2 Worst grade 0 14 2 post-day 1 1 9 8 1 treatment 2 2 1Pre-treatment day 15 (n = 36) Grade 0 1 2 Worst grade 0 6 3 post-day 8 113 10 treatment 2 2 1 1

TABLE 3B Shift tables showing the relationship between the worst ECGabnormali a cycle and the ECG grade observed at presentation for thenext cycle of therapy. Pre-treatment cycle 2 day 1 (n = 34) Grade 0 1 2Worst grade 0 6 cycle 1 1 18 3 2 4 2 1 Pre-treatment cycle 3 day 1 (n =28) Grade 0 1 2 Worst grade 0 2 cycle 2 1 16 1 2 7 2 Pre-treatment cycle4 day 1 (n = 20) Grade 0 1 2 Worst grade 0 cycle 3 1 14 2 6

Evaluations for evidence of myocardial damage or alteration of cardiacfunction:

Troponin evaluations: To evaluate myocardial damage as an etiology ofthe ECG abnormalities, serum cardiac troponin I (cTnI) levels wereobtained prior to the administration of romidepsin (aka depsipeptide)(601 samples) and on the day following treatment (590 samples). Asitemized in Table 4, 10 cTnI samples from 8 patients were found to beelevated; 3 (3.4-11.3 ng/ml) were obtained pre-treatment and werenegative (≦0.2) upon repeat. Three elevated levels (2.1-3.3) obtainedthe day after therapy were repeated the same day and found to benegative (≦0.2). Four were not rechecked, but troponin elevations didnot occur with subsequent doses. CPK samples obtained in parallel withthese 10 elevated cTnI samples were unchanged from pre-treatment, (range16-200). Of note, troponin levels coincident with all ECGs scored asgrade 2, and in 18 cases on the day following those ECGs, were withinnormal limits. It was concluded that the troponin elevations in thesepatients were false positive values.

TABLE 4 Troponin elevation detected among 1191 samples obtained.Troponin CPK Pre- Post- Pre- Post- treatment Repeat treatment treatmenttreatment 3.4 ≦0.2 ≦0.2 39 N.D. 6.4 ≦0.2 N.D. 160 162 11.3 ≦0.2 ≦0.2 2920 Troponin CPK Pre- Post- Pre- Post- treatment treatment Repeattreatment treatment ≦0.2 3.3 ≦0.2 43 28 ≦0.2 2.1 ≦0.2 27 18 ≦0.2 2.6≦0.2 47 16 ≦0.2 8.3 N.D. 70 85 ≦0.2 2.3 N.D. 200 157 ≦0.2 15.8 N.D. 179144 ≦0.2 3.6 N.D. 28 28 N.D. Not Done

Post-treatment global LV function: To determine whether the observed ECGabnormalities were associated with acute LV wall motion abnormalities,echocardiograms were performed on the day following the last dose of thecycle (d 6 for patients treated on days 1 and 5, and day 16 for patientstreated on days 1, 8, and 15). None of the 145 echocardiograms obtainedfrom 34 patients demonstrated a change from baseline. Among 123 ECGsobtained on the same day as the day 6 or day 16 echocardiograms, 23 hadST-segment depression, 82 demonstrated T-wave flattening, and 18 had noabnormalities. These results further support the conclusion that theobserved ECG abnormalities do not reflect a change in cardiac function.

Cardiac function evaluations: To assess left ventricular dysfunction,159 LVEF evaluations were performed by MUGA, echocardiogram or cardiacMRI. All 42 patients underwent pre-protocol LVEF evaluations. Due to thedifferent reference values and methodologies, we evaluated the data frompatients who had MUGAs (19) separately from patients who hadechocardiograms or cardiac MRIs (23), as summarized in Tables 5A and B.Seven patients did not complete a full 2 cycles and did not undergo afollow-up cardiac evaluation. All others had at least one follow-upexam. The data in Table 5 are from the last follow-up exam to allowassessment of function after the patient had received the mostromidepsin (aka depsipeptide) possible.

For patients with MUGA scans, the median time to last scan from on-studyfor the 13 patients with both values was 20.3 weeks, with a range from 7to 154 weeks. The median actual change in LVEF was 1%, with a range fromminus (−)10% to 11%. The Wilcoxon signed rank p-value for the change was0.87; thus, no statistically significant difference was detected betweenthe on-study and the last measured ejection fraction.

For the patients followed by echocardiograms, the median time to lastscan from on-study for the 22 patients with both values was 18.4 weeks,with a range from 4 weeks to 55 weeks. The echocardiograms wereevaluated by an independent reviewer in a blinded manner. The medianactual change in LVEF was −1%, with a range from −17% to 19%. TheWilcoxon signed rank p-value for the change was 0.25; thus, there is nostatistically significant difference between the on-study and the lastmeasured ejection fraction.

TABLE 5A EF evaluations by MUGA in 20 patients On-study Last evaluationTime (mo.) Median Median Median No. of Pts (range) (range) (range) Allpatients 19 61% (46-85) Patients with pre- 13 62% (46-85) 61% (50-91)4.7 (2-35)  and post treatment evaluations Patients treated 7 64%(50-77) 61% (50-68) 14 (5-35) with >6 cycles

TABLE 5B EF evaluations by Echocardiogram in 22 patients On-study Lastevaluation Time (mo.) Median Median Median No. of Pts (range) (range)(range) All patients 23 67% (53-85) Patients with pre- 22 67% (53-85)64% (53-87) 4.2 (1-13) and post treatment evaluations Patients treated 969% (56-85) 68% (58-80) 8.5 (5-13) with >6 cycles

Evaluation of patients treated for more than six cycles: Sixteenpatients received six or more cycles of therapy (6-47), with a mediancumulative dose of 390 mg/m² (164-1674), or 705 mg (269-3761), ofromidepsin. Their LVEF evaluations did not demonstrate a change frombaseline. Of these patients, 8 (50%) had prior therapy that includeddoxorubicin at an estimated cumulative prior doxorubicin dose of 300mg/m² (80-400). These eight patients also did not demonstrate adifference in pre-treatment and post-treatment LVEF (Table 5C).

TABLE 5C LVEF evaluations on patients receiving at least 6 cycles oftherapy. Prior dox Total DP Starting Latest Time Age (mg/m²) CyclesDoses (mg/m²) EF EF Diff (mo.) 41* 300 47 93 1674 50% 61% 30 57 120 8 16164 77% 68% 6 64* 80 32 64 909 54% 64% 35 56 7 21 294 64% 60% 5 42* 1336 333 52% 50% 16 61 7 21 291 69% 78% 6 27 300 13 39 459 56% 61% 9 53 1647 529 67% 61% 14 34 13 39 557 70% 72% 13 54 12 36 500 85% 68% 11 55 618 305 68% 68% 6 59* 150 12 35 448 85% 80% 11 55 300 11 33 459 58% 58%12 69 7 21 326 59% 58% 8 79* 300 6 18 203 70% 70% 9 63 400 6 18 294 64%63% 5 Median 55.5 300 11.5 34 390 65.5%   63.5%   9.8 Range 27-79 80-4006-47 16-93 164-1674 50-85% 50-80% 5-35 Order of enrollment *Patientsremaining on study

QTc evaluation: There is no consensus as to what absolute QTc value orchange of QTc from baseline should be used to evaluate drugs indevelopment. Recommended parameters for evaluation include QTc valuesgreater than 500, 480, or 450 ms or QTc interval increases from baselineof greater than 60 or 30 ms (27, 28).

QTc values greater than 450 ms were detected in 163 (8.0%) ECGs from 28patients, greater than 480 ms in 20 (1%) ECGs from 10 patients, andgreater than 500 ms in 5 (0.2%) ECGs from 4 patients. Eighty-ninepercent of ECGs with QTc values over 450 ms were obtained eitherimmediately post treatment or on the day following treatment. Of note, 2of the four patients with QTc greater than 500 ms had anintraventricular conduction delay detected on ECGs obtained prior toinitiation of protocol.

It has been shown that Bazett's formula overestimates the QTc at higherheart rates (29). All ECGs with QTc greater than 450 ms were associatedwith a HR of 60 beats per minute or greater and 99% with a HR of 80beats per minute or greater. When all QTc were re-calculated usingFriderica's formula, QTc values greater than 450 ms were detected in 27(1.3%) ECGs from 15 patients, greater than 480 ms in 3 (0.1%) ECGsobtained from 3 patients, no QTc was greater than 500 ms.

To determine the statistical significance of changes of QTc frombaseline, a formal analysis was carried out on Bazett calculated QTcvalues from ECGs obtained during the first six cycles of therapy inpatients treated on the day 1, 8 and 15 schedule. ECGs obtainedpre-treatment, post-treatment, and the day following treatment wereincluded in this analysis, as well as ECGs obtained on the third day ofthe first cycle. ECGs from patients demonstrating a baselineintraventricular conduction delay were excluded. Thus, the ECG setcomprised 349 doses administered to 31 patients.

Among 1078 expected ECGs, 1051 (97.5%) were obtained and available forevaluation. Initial analysis revealed that there was no statisticallysignificant difference among the QTc values obtained at the beginning ofeach cycle (p=0.98). Further analysis demonstrated that there was nostatistical difference in QTc obtained prior to the administration ofeach dose within a cycle. This indicates that any change of QTc frombaseline did not persist from one cycle to the next or from one dose tothe next dose. The mean corrected QT interval values for allpre-treatment ECGs on days 1, 8 and 15, and post-treatment, ECGsobtained on days 2, 9, and 16, are shown in Table 6A. In this analysis,the mean value for the QTc on ECGs obtained on the day after treatmentwas longer, p<0.0001, than the mean value of the QTc on ECGs obtainedprior to treatment.

Because the QTc values obtained at the beginning of each cycle were notstatistically different, a mean pre-cycle QTc was determined for eachpatient and defined as baseline. Differences in the corrected QTinterval are presented in Table 6B. A median increase of 16.5 ms (−12.5to 29.5, p<0.0001) was observed on ECGs obtained immediatelypost-treatment after the first dose of the first cycle and 10.8 ms(−33.7 to 78.3, p<0.0009) on the ECGs obtained on day 2 of the firstcycle. Similar changes in QTc were detected after treatment with thesecond and third dose of the cycle (data not shown) and on subsequentcycles (Table 6B). No statistically significant difference was observedbetween the QTc on the ECG obtained immediately post-treatment and theQTc on the ECG obtained day 2 post-treatment ([D2]−[4 hr], p=0.98).

QTc values from ECGs obtained on day 3 were statistically lower thanthose obtained on day 2 (p=0.0009), and similar to those obtainedpre-treatment (p=0.25), indicating that any changes observed withtreatment and within the first 24 hour period had reverted to baselineby 48 hours after treatment. Overall, 514 of 670 ECGs obtainedimmediately post-treatment or on the day following treatmentdemonstrated an increased QTc from baseline, median: 13.42 ms, range:−49.00 to +78.25.

The maximum increase in QTc was 78.25 ms, which represented an increaseof 19% over that patient's mean baseline QTc of 415.75. The maximalincrease of QTc ranged from 3 to 19%, with a median of 11.3%. In thisset, 25% and 2.6% of the doses were associated with a 30 to 60 ms and agreater than 60 ms prolongation of QTc, respectively. Similar resultswere obtained when this evaluation was performed on ECGs obtained in thefirst 6 cycles from all 42 patients with 24% and 3.2% of the dosesassociated with a 30 to 60 ms and a greater than 60 ms prolongation ofQTc, respectively.

TABLE 6A Least Square mean QT interval values for all doses of the first6 cycles of 31 patients as estimated by repeated measures ANOVA n MeanSEM day 1 122 410.3 1.92 day 2 117 422.7 1.95 day 8 117 410.8 1.94 day 9110 426.0 1.98 day 15 110 408.0 1.99 day 16 104 423.7 2.03 Pre-dose 349409.7 1.55 Post dose 331  424.1* 1.57 *p < 0.0001

TABLE 6B Differences in corrected QT intervals QTc Interval MedianDifference n (msec) Range p-value [4 hr]-[Baseline] C1 29 16.5 −12.5 to29.5 <0.0001 C2 28 8.0 −21.5 to 34.7 0.0006 C3 20 15.5 −22.5 to 49.00.002 C4 16 15.9 −22.5 to 30.8 0.002 C5 11 18.2  −0.5 to 26.0 0.002 C613 18.8  −5.5 to 49.0 0.003 [D2]-[Baseline] C1 30 10.8 −33.7 to 78.30.0009 C2 28 13.2 −18.5 to 35.5 0.004 C3 20 5.3 −23.5 to 46.3 0.28 C4 1615.5 −15.5 to 53.3 0.006 C5 11 14.8 −10.5 to 70.5 0.032 C6 12 17.8 −22.5to 48.0 0.096 [D2]-[4 hr] C1 29 0.0 −45.0 to 75.0 0.98 [D3]-[Baseline]C1 23 −2.5 −32.2 to 29.0 0.25 [D3]-[D2] C1 22 −20.0 −63.0 to 50.0 0.0009

Rhythm evaluations: Pre-treatment Holter monitoring was obtained in 37of the 42 patients. Supraventricular tachycardia (SVT) or ventriculartachycardia (VT) defined as more than three consecutive aberrant beats,was noted in a significant percentage of patients, with SVT noted in 14(38%) patients and VT noted in 5 (14%) patients with 4 (11%) patientshaving both. Supraventricular or ventricular ectopy was also frequentlynoted prior to initiation of romidepsin (aka depsipeptide) therapy, with24 (65%) and 14 (38%) patients found to have more than one SVE or VEbeat per hour, respectively.

Twenty-four hour Holter monitoring was performed during 20administrations of romidepsin (aka depsipeptide) to 9 patients,providing additional safety information. Two patients were noted to haveSVT; however, these episodes were similar to those observed on thepretreatment Holter. No patient had VT, including 2 patients observed tohave VT pre-treatment.

Telemetry monitoring for 24-36 hours was performed on 36 patients duringand after administration of romidepsin (aka depsipeptide). One patienthad significant ectopy prior to starting therapy, with VT, SVT andepisodes of accelerated idioventricular rhythm. This patient underwentboth pre treatment and post treatment electrophysiologic studies thatdemonstrated no inducibility. Three additional patients were observed tohave rare SVT. These patients were noted to have SVT andsupraventricular ectopy of similar frequency on pre-treatment Holter.Four additional patients were observed to have wide complex tachycardiawith a maximum frequency of one event per 24 hr period and length of 4to 12 beats, all similar to that observed on pre-treatment Holters.

Cardiac events observed on trial: The one patient excluded from the dataanalysis was a 62 year old patient who was found to have a true positiveelevated troponin after receiving the first dose of his second cycle ofromidepsin (aka, depsipeptide). Cardiac evaluation included a cardiacMRI that detected an intracardiac mass that was later confirmed to beT-cell lymphoma. This patient was then removed from study.

One of the patients found to have a QTc greater than 500 was then placedon telemetry and was observed to have 12 beat run of VT that wasasymptomatic and did not recur. Concurrently, this patient had abnormalmagnesium and potassium levels that may have been related to herlymphoma, prior chemotherapy, or underlying celiac disease.

Four additional patients with VT were identified as described above. Theonly patient with significant ectopy had ventricular trigeminy. Thispatient was noted to have significant ventricular ectopy on thepre-treatment Holter monitor. Furthermore, this patient also was notedto have below normal potassium and magnesium levels. At that time ourcardiologist recommended maintaining this patient's potassium andmagnesium levels in the high normal range. The decision was then made toincorporate this into the protocol for all of the patients.

Another patient developed atrial fibrillation. This patient had ahistory of COPD and premature atrial contractions on Holter monitorprior to treatment with romidepsin. One patient found to havesignificant ectopy prior to initiation of protocol was subjected topre-treatment and post-treatment EP studies that demonstrated no changein intracardiac conduction or inducibility of any arrhythmias.

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All references cited herein, whether in print, electronic, computerreadable storage media or other form, are expressly incorporated byreference in their entirety, including but not limited to, abstracts,articles, journals, publications, texts, treatises, internet web sites,databases, patents, and patent publications.

EQUIVALENTS

The foregoing has been a description of certain non-limiting preferredembodiments of the invention. Those skilled in the art will recognize,or be able to ascertain using no more than routine experimentation, manyequivalents to the specific embodiments of the invention describedherein. Those of ordinary skill in the art will appreciate that variouschanges and modifications to this description may be made withoutdeparting from the spirit or scope of the present invention, as definedin the following claims.

To give but a few examples, in the claims articles such as “a”, “an”,and “the” may mean one or more than one unless indicated to the contraryor otherwise evident from the context. Claims or descriptions thatinclude “or” between one or more members of a group are consideredsatisfied if one, more than one, or all of the group members are presentin, employed in, or otherwise relevant to a given product or processunless indicated to the contrary or otherwise evident from the context.The invention includes embodiments in which exactly one member of thegroup is present in, employed in, or otherwise relevant to a givenproduct or process. The invention also includes embodiments in whichmore than one, or all of the group members are present in, employed in,or otherwise relevant to a given product or process. Furthermore, it isto be understood that the invention encompasses all variations,combinations, and permutations in which one or more limitations,elements, clauses, descriptive terms, etc., from one or more of theclaims or from relevant portions of the description is introduced intoanother claim. For example, any claim that is dependent on another claimcan be modified to include one or more limitations found in any otherclaim that is dependent on the same base claim.

Furthermore, where the claims recite a composition, it is to beunderstood that methods of using the composition for any of the purposesdisclosed herein are included, and methods of making the compositionaccording to any of the methods of making disclosed herein or othermethods known in the art are included, unless otherwise indicated orunless it would be evident to one of ordinary skill in the art that acontradiction or inconsistency would arise. In addition, the inventionencompasses compositions made according to any of the methods forpreparing compositions disclosed herein.

Where elements are presented as lists, e.g., in Markush group format, itis to be understood that each subgroup of the elements is alsodisclosed, and any element(s) can be removed from the group. It is alsonoted that the term “comprising” is intended to be open and permits theinclusion of additional elements or steps. It should be understood that,in general, where the invention, or aspects of the invention, is/arereferred to as comprising particular elements, features, steps, etc.,certain embodiments of the invention or aspects of the inventionconsist, or consist essentially of, such elements, features, steps, etc.For purposes of simplicity those embodiments have not been specificallyset forth in haec verba herein. Thus for each embodiment of theinvention that comprises one or more elements, features, steps, etc.,the invention also provides embodiments that consist or consistessentially of those elements, features, steps, etc.

Where ranges are given, endpoints are included unless otherwiseindicated. Furthermore, it is to be understood that unless otherwiseindicated or otherwise evident from the context and/or the understandingof one of ordinary skill in the art, values that are expressed as rangescan assume any specific value within the stated ranges in differentembodiments of the invention, to the tenth of the unit of the lowerlimit of the range, unless the context clearly dictates otherwise. It isalso to be understood that unless otherwise indicated or otherwiseevident from the context and/or the understanding of one of ordinaryskill in the art, values expressed as ranges can assume any subrangewithin the given range, wherein the endpoints of the subrange areexpressed to the same degree of accuracy as the tenth of the unit of thelower limit of the range.

In addition, it is to be understood that any particular embodiment ofthe present invention may be explicitly excluded from any one or more ofthe claims. Any embodiment, element, feature, application, or aspect ofthe compositions and/or methods of the invention can be excluded fromany one or more claims. For example, in certain embodiments of theinvention the biologically active agent is not an anti-proliferativeagent. For purposes of brevity, all of the embodiments in which one ormore elements, features, purposes, or aspects is excluded are not setforth explicitly herein.

1-27. (canceled)
 28. A method for treating a cutaneous T-cell lymphoma(CTCL) or peripheral T-cell lymphoma (PTCL) in a patient comprisingintravenously administering to the patient a unit dose form ofromidepsin over a time period of over 30 to 60 minutes.
 29. The methodof claim 28, wherein the romidepsin is administered over a time periodof over 30 to 50 minutes.
 30. The method of claim 28, wherein theromidepsin is administered over a time period of over 30 to 40 minutes.31. The method of claim 28, wherein the unit dosage form contains from0.5 to 28 mg/m² of the romidepsin.
 32. The method of claim 31, whereinthe unit dosage form of romidepsin is 8 mg/m², or 10 mg/m², or 12 mg/m²,or 13 mg/m², or 14 mg/m².
 33. The method of claim 28, wherein theromidepsin is administered on days 1, 8, and 15 of a 28-day cycle. 34.The method of claim 33, wherein the 28-day cycle is repeated for 3-10times.
 35. A method for treating a CTCL or PTCL in a patient comprisingthe steps of: intravenously administering romidepsin over a time periodof over 30 to 60 minutes; assessing serum potassium level in thepatient; assessing serum magnesium level in the patient; administeringpotassium and/or magnesium to the patient if the serum potassium and/ormagnesium concentration is below the normal range.
 36. The method ofclaim 35, wherein potassium is administered to the patient if the serumpotassium concentration is below 3.8 mEq/L.
 37. The method of claim 35,wherein magnesium is administered to the patient if the serum magnesiumconcentration is below 1.9 mEq/L.
 38. The method of claim 35, whereinthe romidepsin is administered over a time period of over 30 to 50minutes.
 39. The method of claim 35, wherein the romidepsin isadministered over a time period of over 30 to 40 minutes.
 40. The methodof claim 35, wherein the step of administering potassium and/ormagnesium occurs prior to initiation of the romidepsin therapy.
 41. Themethod of claim 35, wherein the step of administering potassium and/ormagnesium occurs concurrently with initiation of the romidepsin therapy.42. The method of claim 35, wherein the step of administering potassiumand/or magnesium occurs following initiation of the romidepsin therapy.43. The method of claim 35, wherein after administering potassium theserum potassium concentration in the patient reaches at least 3.5 mEq/Lprior to initiation of the romidepsin therapy.
 44. The method of claim35, wherein after administering magnesium the serum magnesiumconcentration in the patient reaches at least 1.5 mEq/L prior toinitiation of the romidepsin therapy.
 45. The method of claim 35,wherein the romidepsin is administered as a unit dosage form, whereinsaid unit dosage form contains from 0.5 to 28 mg/m² of the romidepsin.46. The method of claim 45, wherein the unit dosage form of romidepsinis 8 mg/m², or 10 mg/m², or 12 mg/m², or 13 mg/m², or 14 mg/m².
 47. Themethod of claim 35, wherein the romidepsin is administered on days 1, 8,and 15 of a 28-day cycle, wherein the 28-day cycle is repeated for 3-10times.